One problem I heard of was people buying a house for each character on the account. I guess that's a great idea of a roleplayer has millions of gil to burn on buying up multiple plots, but not so great when it's done exclusively to resell those plots once people are willing to pay any price set. That's where I bet some gil buying comes into play.

Now if SE had limited personal housing to one per server per account, RPers would cry about immersion, but it would prevent the reselling that Yoshi P now wants to stop. Hindsight is 20/20 but it can be added even now by giving players an option of which plot to keep. Of course this means there needs to be a way to reclaim items from those newly emptied plots... Maybe an NPC that acts like a retainer with a much expanded inventory to hold those items?