Does anyone actually know the rules on these leagues?
This is all I could find in the NCAA Div 1 handbook...
14.7.3 Exceptions to Outside-Competition Regulations.
14.7.3.1 In All Sports.
(a) High School Alumni Game. A student-athlete may compete in one game a year involving players from the student-athlete's former high school and its alumni team. In sports other than basketball, this game must take place during an official vacation period of the institution's academic year.
(b) Olympic Games. A student-athlete may participate in the official Olympic Games, in final tryouts that directly qualify competitors for the Olympic Games, and in officially recognized competition directly qualifying participants for final Olympic Games tryouts. (Revised: 1/14/97 effective 8/1/97)
(c) Official Pan American Games Tryouts and Competition. A student-athlete may participate in official Pan American Games tryouts and competition. (Adopted: 1/14/97 effective 8/1/97)
(d) U.S. National Teams. A student-athlete may participate in official tryouts and competition involving national teams and junior national teams sponsored by the appropriate national governing bodies of the U.S. Olympic Committee (or, for the student-athletes representing another nation, the equivalent organization of that nation or, for student-athletes competing in a non-Olympic sport, the equivalent organization of that sport). (Adopted: 1/14/97 effective 8/1/97)
(e) Official World Championships, World University Games and World Cup Tryouts and Competition. A student-athlete may participate in official World Championships, World University Games and World Cup tryouts and competition. (Adopted: 1/14/97 effective 8/1/97; Revised: 8/9/01)
(f) Multisport Events. A student-athlete may participate in officially recognized state and national multisport events. (Adopted: 1/14/97 effective 8/1/97)
14.7.3.2 Additional Exceptions for Basketball Only.
(a) Summer League. A student-athlete may compete during the period between June 15 and August 31 or the institution's opening day of classes (see Bylaw 17.02.11.3), whichever comes earlier, on a team in a league certified per Bylaw 30.14, provided the student-athlete has received written permission from the institution's athletics director (or the director's official representative) prior to participation in the league. If the student-athlete is transferring and has been officially accepted for enrollment in a second institution, and if the previous institution certifies that the student has withdrawn and does not intend to return to that institution for the next term, this written permission is to be obtained from the member institution to which the student-athlete is transferring. Under such circumstances, the student-athlete does not count on the summer-league roster as a representative of either institution. (Revised: 1/11/94, 1/14/97 effective 8/1/97, 10/28/99 effective 8/1/00, 2/24/03, 4/14/03)
(b) Puerto Rico Superior Basketball League. A student-athlete who is a resident of Puerto Rico may participate in the Superior Basketball League of Puerto Rico (see Bylaw 12.02.4).
(c) United States vs. U.S. National Teams. A student-athlete may participate in the United States against U.S. national teams. (Adopted: 1/14/97 effective 8/1/97)
(d) Outside-Team Tours. A student-athlete may participate in an outside team summer foreign basketball tour (see Bylaw 17.32.2).
(e) Predraft Basketball Camp. A student-athlete using the draft exception set forth in Bylaw 12.2.4.2.1 may participate in a predraft camp sponsored by a professional sports organization (during the summer or academic year), provided the student-athlete has received written permission from the institution's director of athletics. (Adopted: 4/24/03)
30.15 SUMMER BASKETBALL EVENT CERTIFICATION -- MEN'S BASKETBALL
In men's basketball, in order for a summer basketball event (e.g., camp, league, tournament or festival) to be certified, a certification application form must be submitted each year to the NCAA national office 45 days before the start of the event. An event review form for each event also must be submitted to the national office not later than three months after the event sessions. The following criteria must be met by each event in order to be certified: (Adopted: 11/1/01 effective 4/1/02, Revised: 1/13/03, 4/29/04)
(a) Admissions fees charged to all event participants must be similar;
(b) No air or ground transportation or other gifts or inducements shall be provided to the event participants or their coaches or relatives;
(c) A prospective student-athlete who attends an NCAA certified event shall not retain any athletics equipment or apparel provided for his use at the event other than an event T-shirt. All other apparel (e.g., shoes or shorts) may be retained only if the prospective student-athlete is charged the normal retail value of such items (as opposed to the event's cost in purchasing the items);
(d) Compensation provided to event personnel shall be commensurate with the going rate for event personnel of like teaching ability and event experience;
(e) The event or tour shall include a comprehensive educational session presented in-person or in a video format that includes a review of regulations related to initial-eligibility standards, gambling, agents and drug use; (Revised: 1/13/03)
(f) An event operator, staff member of a league or member of any team may not participate if the individual has been found guilty or pleaded guilty in a court of law for having been involved in sports bribery, point shaving or game fixing;
(g) The event shall not be conducted in a venue where sports wagering on intercollegiate athletics is permitted, or on property sponsored by an establishment that permits sports wagering on intercollegiate athletics or branded with signage for such an establishment; (Adopted: 1/14/02)
(h) No individual or agency involved in the marketing of any individual's athletics reputation or ability (including an employee of an agent or anyone associated with an agent in his or her capacity of marketing any individual's athletics reputation or ability) shall be associated in any capacity with the event (or any team participating in the event); (Revised: 11/1/07)
(i) The event (and any team participating in the event) may not receive financial support from any individual or agency involved in marketing any individual's athletics reputation or ability or any representatives of an NCAA member institution's athletics interests that is assisting or has assisted in the recruiting process;
(j) Individuals involved in coaching activities must have been approved in accordance with guidelines established by the NCAA basketball certification staff; (Revised: 1/13/03)
(k) Participants on nonscholastic teams must be legal residents of the state in which the team is located or a geographically adjoining state and not more than a total of three prospective student-athletes from adjoining states may participate on any one nonscholastic team; (Revised: 1/13/03)
(l) A participant may receive an award, provided the cost of the award is included in the participants entry fee; (Adopted: 1/13/03 effective 1/13/03)
(m) Qualified medical personnel must be present at the event; (Adopted: 1/8/07)
(n) Athletically related activities are precluded prior to 8 a.m. and the last athletically related activity may not begin later than 10 p.m.; (Adopted: 1/8/07)
(o) Prospective student-athletes may participate in no more than five games over a rolling two-day period and in no more than three games on any one day; and (Adopted: 1/8/07)
(p) The price of event packets must be listed on the event certification application and the price must be made available to coaches prior to their arrival at the event; and (Adopted: 1/8/07)
(q) The event operator must provide proof of medical insurance coverage for event participants. (Adopted: 11/1/07)