Who are all these investors, and is there a limit to the umber of people that can afford their product? I hear they buy real estate, then don't use it because i

Who are all these investors, and is there a limit to the umber of people that can afford their product? I hear they buy real estate, then don't use it because it's 'just a place to stash money', or 'they'll make money on the appreciation' and it just seems like there's a limited group of people buying things that can no longer be used as things because they're 'held money'. They won't be worth quite so much if there's nobody that can afford them. Then what will the investors spend their money on?