Greedy? For some, not for others...
I think 'greed' is the wrong word for people who were fooled into buying a house, taking on a mortgage they couldn't really afford (or understand), only to become 'upside-down' or foreclosed on a few years later. Greed is illustrated by the Big Banks, the mortgage lenders, allied politicians, etc.
Those are the folks who made out or remain making billions, while not being held accountable for almost tanking America's financial system. Somehow those consumers who you claim were being "greedy," who are now probably a relative-away from being completely homeless, as opposed to 'making out like bandits', doesn't qualify.
Foolish, naive, vulnerable, easily-manipulated, and yes, even a few stupid homebuyers, but 'greedy' isn't the correct word I'd use.