Having made similar experiences, I do have to say your conclusion to not be the good person isn't in your own interest, especially, but even otherwise, if your goal is power and wealth.

People like good things. They'll go out of their way to expend time, energy and money to have "good". You could be the source of that good and receive all of these if you try to truly understand others' view of what's good.

Coercive systems do happen, but rarely last, because people will also spend time, energy and money to get rid of them.

Just don't be fooled that there's a universal moral code. What's good for one might not be for another. You might appreciate "Science and Human Behaviour" by B.F. Skinner if you're interested in the mechanics of it.