I don't think successful people get everything with ease (I know some people who are pursuing high-$$ careers and they constantly complain about lack of sleep and stress). But they do seem to have a higher tolerance for frustration. They can usually withstand huge setbacks and still be determined enough to pursue their goals. With us, the simplest setback just devastates us. I don't know if it's simply a psychological problem, or if it has biological roots, but it's very discouraging.
Oh of course not, I'm not saying successful people are handed everything. A lot of hardworking people deserve everything they've earned. I'm talking about the people you know who get everything they want based upon looks or their parents, money, etc. It's ridiculous at times. Those people are who make it intolerable at times. I do agree with you though in your above post.