I don't know if this has been said on 140 pages of comments but:
1- Offer a real ammount of plots for each account or the population playing.
2- Place restrictions over accounts e.g: Only 1 character in someone's account would be able to get a personal house for each server. So that would prevent housing speculation. Regarding the chance of FC's ownership likewise. If this is extended for each datacenter, even better to prevent RMT transactions in-between servers at the same datacenter.
3- If this kind of housing is giving you problems to be implemented, consider it being instanced.
