You may be right but there is a big difference in being selected in the 20s and being a lottery pick.
Let's say Brackins is selected #20 in the 2009 NBA draft (that's probably too high IMO). Based on 2008 $$, he would make this:
Year 1 - $1,063,000 Guaranteed
Year 2 - $1,143,000 Guaranteed
Year 3 - $1,223,000 Team Option
Year 4 - $1,886,000 Team Option
Total $ after 2 years - $2,206,000
Total $ after 4 years - $5,315,000
Let's say he stays and in 2010 he is selected at #8 overall.
Year 1 - $1,749,000
Year 2 - $1,880,000
Year 3 - $2,011,000
Year 4 - $2,564,000
Total $ after 2 years - $3,629,000
Total $ after 4 years - $8,204,000
That is a big difference. And if he stays and moves up into the top 8, he will get even more money.