Exactly.
If Ohio State were seriously looking at the "death penalty" (which, for several reasons discussed, they are not), there's absolutely no way they report Tressel's failure to disclose. No way.
And if the players who received the benefits would have only been subject to a 2-game suspension as opposed to the 4-game suspension A.J. Green received or the full-year suspension the UNC players received, he may have been more inclined to self report. As it stands, the NCAA already levies obscene punishments to student-athletes for minor violations of NCAA rules. If those same players had committed a DUI, they'd probably only be suspended for 2 games. Tell me the logic in that...