I support this idea but I understand what people are saying regarding potential abuse.
The idea mentioned above, of putting a timer onto a relinquished property so it can't be bought immediately is one way to prevent it. If it was randomised, say between 1 and 6 hours I doubt anyone would hand over gil in-game.

Restricting the number of houses per account would help, as well. One FC house and a private house per server should be enough as long as SE also allow people's alts to share the private house.