Variations of this concept exists many places. It's not bad. But does lead to people unable to move. Because they don't earn enough from the sale to buy a new

Variations of this concept exists many places. It's not bad. But does lead to people unable to move. Because they don't earn enough from the sale to buy a new house. And buyers can't get a property nobody is selling (so you risk corruption too). Could also cause a bit of market distortion. Probably not a huge problem.