Plot migration and why the housing problem persists, SE please start listening.

[Krokov]

Because that's part of how you obtained the new plot. You're trading in something you own for a 30% discount of the reduced price of it for the new thing. That's 70% of the reduced price lost, so if you bought at max price that's even more money lost within the trade. You lose out more than you get reduced.

I suppose but IMO if you made back what you spent on say a small and then upgraded to a medium that had devalued some or even if it hadn't, you're still obtaining it at less then a buyer. That's all.