Might be slightly OT, but I'd just like to point out that thievery is not, in itself, exploitative. You can use it to exploit, true -- like almost anything, by the way --, but you can actually RP in this RPG (novel idea, I know ^^). If you have the staple thief in the party and don't give everybody else, i.e. warriors and wizards etc. who would not normally be skilled at, or even interested in, thiefy stuff, +thievery gear, don't use throw-away hirelings, etc., then thieving is anything but OP, imo.