In order for this to work you have to build enough oversupply that anyone at any time who wanted a 30k house could get one (and wouldn't have to drive two hours out of town). To do this you probably need to build huge condo blocks like you find in Hong Kong, or similar cities and those buildings aren't inexpensive. Possible, but I don't see it being something that happens without strong government involvement. Which itself tends to be a problem unless you happen to luck out with the proverbial benevolent dictator.
Regulations aren’t automatically good or bad, consider each as a possible multi-edged sword. Banning leaded gas in cars was mostly good.
Ever seen a cottage? The people living next to my parents lived in one, no more than 500 sq.ft. Happily raised two kids in it; happily lived in it until their deaths. On a nice lot on a nice street, far from cheap shit. Maybe the favela ( been reading Sterling?) is in your head.
$30B would buy a million of these. Build a few less jets.