I find it a little bit funny you think the good paths are too rewarding because last I remember the "rewards" I got for playing good in DOS2 were a) death or b) become a soulless husk.
To be honest I found D:OS2 so dull and incoherent I really couldn't bring myself to care about anything that happened at the end. Too little too late. I do like the concept on paper though.
Ah, the old 'do true selfless acts really exist?' (...) So about the game rewarding good acts (as well as selfish ones) I think is quite alright.
That wasn't really a point I was trying to make. More that if I get all my character could possibly care about (highest survival chance, money, power, social standing), than I find it really hard to come up with a character who would be interested in dark path.