After the NCAA ditched the variable number of wrestlers per weight class in 2009 (I believe that's right), and went with 33 wrestlers PER WEIGHT CLASS, I contacted the NCAA, and got the answer below. Remember, before 2009, it was still a TOTAL of 330, but different numbers for each weight class.
" According to a member of the NCAA Wrestling Committee the number to think about is 330, not 33. When the new qualifier system was put in place and the wild-card (now at-large) selections were no longer chosen by conferences the overall number of qualifiers (330) became evenly distributed across the ten weight classes. That number of qualifiers is determined by a percentage of how many Division I schools have wrestling. Though there has been some contraction the number of qualifiers is, for now, safe."
Appears, even with fewer programs, they've stuck with 330 (or 33x10).