I just heard a bit on NPR which mentioned banks(?) which gave bonuses to people who talked home buyers into loans with higher interest rates than the buyers qualified for.
I haven't been able to verify this, but if it happened, it was quite a disgusting practice.
I'm wondering whether it would be a good idea to require that bonus schemes be made public.
Addendum: Check out Hard Facts, a book about research on what does and doesn't work in management-- it has quite a bit about how hard it is to devise an incentive scheme which actually encourages the behavior you hope you're rewarding.