Perhaps then, a cap could be introduced to the amount that can be charged, relative to the base price of the plot. So let's say a small plot goes for 4m (plus 450k for the house itself), you cannot sell above say 5m (allowing some room to cover lost furnishings, or perhaps any furnishings left behind could also be transferred). Flippers then can't take advantage of this. Then make it that ANY PF for selling houses is instantly against the rules and reportable, and there ya go. As a result, you could also add a randomiser for when the plot goes free (I'd say between 180-360 days of the plot being relinquished, released at any random second between that point), to stop flippers using that as a means to sell the plot to others for massive profit, and you kinda destroy their market.