I believe that expectations of payouts are very heavily influenced by the minimums set forth in the PDGA Tour Standards (
http://www.pdga.com/tour/standards):
A Tier Ams - $25 players pack, 100%+ payout, $30 $50 $60 max entry fee
B Tier Ams - $10 players pack, 100%+ payout, $25 $30 $50 max entry fee
C Tier Ams - no players pack, 85% payout, $20 $20 $30 max entry fee
I believe that this is the crystal ball you are in search of.
If your take on things is truly representative of how things are done in your area, you have established that expectations can be altered by local customs.
But, the expectations set by this document explain the outcry over your demand/expectation that TDs not neglect blowing these minimums out of the water.