I have a friend with a studio here in Romania. A "good girl" that perform professionally (and look hot :P) can earn 200$ - 500$ on Livejasmin.com on 8 hours work (hard work
).
Also Imlive.com pays good , but there is more complicated rating system.
Camsathome and Interclimax chathosts get like 1000$ - 2000$ each month, they work more with studios.
A girl from Camcontacts.com get like 50$ - 200$ / 8 hours work, but there are girls that get more than 300$ each day, depends.