I would, because I have a conscience, and I'd rather not be rich than be a rich twat. But also, the assumption in your comment is that evil people are guaranteed to be lucky and rich, which isn't universally true. There a many good people that are lucky and rich and many evil people that are lucky and rich.
Bernie Madoff is an evil person that was extremely wealthy and evil and it caught up to him. Trump is evil and wealthy with power. I'd rather be dead than be either of those people.
You should be a good person because it's the right thing to do, not because you expect a reward or wealth.