>>5
I can understand how you feel, and I think it's just human nature to be greedy. It's to our evolutionary advantage, after all.

When asked how much was enough, John D. Rockefeller answered, "Just a little bit more." This story is pretty cliche, and possibly apocryphal, but you get the point. Even if you had loads of money, you'd still want more.

The way I see it though, this isn't necessarily a bad thing. It's human nature to strive for more. Just don't compromise your morals!