Re: gaming fees...?
Its not a MMORPG and everything is instance. Thier servers do not need to support over 100 people in a single area. After 40 or so, it creates a new lobby, all the adventure areas are limited to groups.
Thier server costs are tiny compared to a MMORPGs.
Basically the same way Blizzard got away with it in Diablo 1/2, They are the same type of game...