What can I do with people's secrets?

I overhear a lot. I think it’s because people think I have a meek personality and they think I won’t tell anyone. But the truth is, if I could pin someone I really hated, I would do it. Or, if i see it’s the right thing to do, I would tell.

Basically, people just talk when I’m in the room and expect nothing to happen. It’s really their own fault. Also, I find that omission of information can cause equal damage as letting people know.

So, how can I profit from these people and their dirty lives? Is there a way I can do it without getting caught?