10 bucks is standard
if you think buying the game == right to play online then you're outta your f'n mind
unlike SC/war3/HL/whatever, not only do they have to play for bandwidth, they gotta pay for servers and junk to house all that info, + people to monitor games etc etc etc
although paying 10/month means you're paying 10/month to get screwed
(played uo for 18 months, i know how it is)