Rewarding someone when they do what you want is just as sleazy and manipulative as punishing them when they do what you don't want. It might be the fact that a

Rewarding someone when they do what you want is just as sleazy and manipulative as punishing them when they do what you don't want. It might be the fact that a child doesn't realize that, but an adult undoubtedly (eventually) would, and be just as resentful.