I think it depends on how mature you are. I know when I was younger, I thought I "needed" a lot more than I actually do. Now that I'm a crabby old man, I find that my desire for material goods and wealth are much much less. American consumerism and materialism is a sickness in many cases. I try to avoid falling into the trap.
This is exactly what I am talking about. Different people have differing definitions of greed.
I try to get all of the tax loopholes/deductions I can. To the Democrats, that is greedy.
I try to make all the money I can - and to my parents, I am greedy.
I try and keep my money because I believe I am giving enough to "needy" people through the government. You think I am greedy.
There is one pivotal point though. I don't think I am greedy and that is what counts.
You can't make everyone happy or you will kill the donkey.