The 'Candy Shop' rocker says his troubled upbringing made him believe that having a lot of money would solve all his problems, and even though he no longer thinks that is the case, he always strives to do better.
He said: "$400 million? I'm not sure how much I have, but that sounds great. I don't really think it'll ever be enough. I used to equate success with my finances because I didn't have anything, and when you don't have any money, it seems money is the answer to all your problems. Then you get money, and you realize that you've got a whole new set of problems."
Despite his worldwide successes, 50 – whose real name is Curtis Jackson – insists he is still down to earth because he is happy to travel economy.
He added to Interview magazine: "I really don't mind flying coach if I have to. If the front of the plane is sold out, I'll sit in the back. Some people are like, 'Oh, first class is sold out. I can't go.' I guess they care about people seeing that they're not sitting in first class.
"But I'm clear with my financial space—I don't need to get any validation by someone else who sits next to me in first class. If you think a seat in first class makes you a star, then you're not one."