When they're successful, I'm enjoying myself. Now, other people might not. I'd like to see a perfect world and in a perfect world, everybody is a nice person. Depends on your definition of success. From what I've seen, it very frequently does not.
Nice guys finish last.
I'm sure there are others that have reached the same success level that are nice people, too. But from what I've seen in the world of business, that's a little unusual. Your priority has to be on being nice, not on being successful. If you're a nice person and you're talented, then success will follow. If you're a nice person and you're not talented, success won't follow, but at least you're a nice person and you'll enjoy life.