[acchow]

> And if a bunch of people ever feel the need to cash out at once, they'll find out just how much value they really have when there's nobody buying.

This is a nice natural mechanism for the bubble to burst itself. Housing is not like this at all. Everyone can in fact get cash all out at once at the hyper-inflated prices (no real buyers needed!) by just doing a "cash out refinance" to the bank.