Guess in regards to the RMT deal they could at least make a quest that has to be completed before purchasing land in a city state is allowed. And while it might be annoying maybe they can add a "tend to your property" style system were you have to be actively interacting with your property at least once every 5 days. (such as you showed you went to your chocobo stables, went inside the house etc) Would put pressure on RMTs to have to unload properties faster and cause them to not be able to inflate prices.