if its pvp server from Boredom Type it would be fun to be 120cap
but this thing with donating 30$ and get GM title is **** i think :/ i know you need money for the project but if the GMs are chosed by "who has more money" then most of them will be lame players only insulting others etc...
for the cap:
if pvp server 120cap
if its with some lvling till max lvl then 90cap with full 9dg (or with 9dg+10dg weapons)
sorry for my english...and good luck with the project