No. I buy things I need or want depending on the price. I earned the money to buy them, so I don't feel greedy when I do buy them (however, if I bought all of the remaining stock of a certain item and left nothing for the next person, yes I feel like a greedy bastard). I am stingy however, and hate spending that money, but eventually I'll cave and buy whatever it is I need or want.
At the moment I need (or maybe want, depends how I break it down) a newer car. I have the money, but I'm too cheap to get one. Hell, I've spent over two months now just trying to find tires I like for my truck, and those I need badly.