Yep. In fact the main problem I have with always rewarding the "Good" player isn't that it makes being "Evil" less fun, but it undermines the neutral mercenary role.
Sure, some quests can still be given out by super trusting and trustworthy NPCs who give you a little pressie afterward. But I'd like a lot more negotiating deals before hand, characters trying to rip you off and some who just give you a quick thanks for your efforts (who may have to be "persuaded" to show some proper appreciation).
Even if it's just for the sake of some variety.