We rely on cash payments for other things to, like info about criminals and such. Why should we expect people to do hard things unless they are in their best i

We rely on cash payments for other things to, like info about criminals and such. Why should we expect people to do hard things unless they are in their best interest? Regardless of morality, that's just how people are. This isn't about finance being rotten, it's about that to get people to do what you want, you have to reward them. This is what bonuses are about, what giving treats to dogs for good behavior is about, etc.