Stubhub is the very definition of market value. Now the market value may drop over time, but only typically because some held out too long at too high a price and then just try to get what they can. At the same time, the market value may go up as more people start thinking about football season and realize 'damn there arent any tickets available through ISU, lets see what they run for online'.
What some desperate schmuck drops their tickets for 10 minutes before the game because they failed to sell where the rest of the market did is not indicative of the overall market value.
And yes, i do think Iowa holds a premium of 10x those games. And it has nothing to do with 'superbowl' and everything to do with you have a TON more interested people in the game. Casual fans of both sides are more interested, and its the one game a year fans of both major teams in the state want to buy tickets to a game in only one stadium. For similar reasons, UNI is also a damn good scalping ticket.
Additionally, ISU-Iowa will sell out this week most likely (before tickets go on sale to the general public), meaning you'll have to buy from someone else to even get hillside, driving the price up, whereas you'll likely be able to buy an OSU (or most other games) hillside for quite some time.