Others have mentioned this already, but it really is all relative. I remember reading an article that asked different people how much they needed to make a year in order to be rich. These aren't the exact numbers, but basically people making $15K said about $50K, the people making $50K said $120K, and the people making $120K said $500K.
If I had enough money to afford a house like this, I would consider myself rich.
http://www.zillow.com/homedetails/14...56036512_zpid/