His decision is wise. For what he have sold his will give him more houses to be built when few more years goes on.
that is not a wise decision at all unless you have a way of seeing the future in your magic ball.
what he did (or says he did) is what a gambler does. and that is not wise nor and investment, it is a gamble.
of course there is always the possibility of a big profit but there is also the possibility of loss which is not small chance either.
for example if you sell everything and buy now lets say at $400 and the price goes up in a couple of months then you might even double your money and buy a bigger house. but think of it this way, you don't have a home for that period and if price stays stable for a long time (lets say a year) you are stuck in this state for a longer time. and worst case scenario is the price goes down then you have lost half of what you had in the first place and now you are homeless on top of that.
