The way I see in this system to defend is very slim and it shows no justification in people hogging houses and selling it for ridiculous prices. If people don't want to use that house, then just let people have who really want it.

If you want to sell it only for resale price to have it back, i'll understand. But to sell it for 200-500m on a large, then 30-50 for small and 80-150m for medium is like definitely showing the way of people being more greedier than it needs to. That's why housing system in this cannot be defended whatsoever.