i was just talking about this with a friend of mine a few minutes ago.
on my paysite,
http://www.zgasm.com i saw a significant increase in signups when i moved from 19.99 to 29.99 a month.
As usual peeps associate cost to quality and i think that sells them.
Additionally, my friend and i were talking about this and i THINK he's going to raise his prices for a second time... after the positive results he saw from the last increase. He is going to about $35 per month.
Affiliates like the bigger payout too..