I'm from a small server, so most of the housing problems don't really apply to me, but I still follow discussions around housing issues.

It seems that the #1 complaint about the current implementation (so, not talking about the numerous suggestions to go to instanced individual housing or stuff that's a dramatic change) is the amount of players who hoard houses for the sole purpose of flipping them for a profit.

It's against the rules, but the GMs can't possibly police everything well enough to catch everyone making it profitable enough for the people who do it anyway. I've seen plenty of "lock housing to 1 per account" suggestions, but since FC leaders shouldn't be prevented from having a personal house if they want, there's no stopping determined hoarders from just owning 8 FC houses per account instead of 8 individual houses.

I had a random thought the other day which might be a potential solution. Instead of trying to introduce some hard restrictions on house ownership, why not instead attack the economic incentives of house flipping? My thought was that some kind of "land tax" could be added to housing which would make the act of simply sitting on land cost gil. In order to turn a profit, then, the seller would have to sell the house for more than the purchase price + total tax paid while waiting for a buyer.

It doesn't have to be too extreme, something like every 30 days:
Small house - 100k gil
Medium house - 500k gil
Large house - 1mil gil
Prices would apply the same for both individual and FC owned houses. The jumps in price between the sizes loosely correspond to the differences in the purchase price of each size.

I know the idea of constantly recurring expenses on owning a house would be a huge turn-off for many, but if it served to deter people from engaging in house-flipping, then I'd expect more houses to open up for people who would actually use them and decorate them. Besides, with housing basically being a large gil sink, I'd think this would fit right in.

Besides, it even opens the opportunity to make the auto-demolition a bit more friendly. Instead of a straight 45-day auto-demolition, house owners might get an escrow account with their house in which they can deposit up to 6x the 30-day tax. If the 30 days is up and your escrow doesn't have sufficient funds to cover the tax, then auto-demolition happens right then (of course, you should get e-mails warning of this as the date approaches). This would give people the ability to pay in advance to keep their house through an extended break.

As a player from a small server where our FC had no trouble getting a house once we could afford one and then later getting my own personal house after auto demolition was added (and seeing plenty of small plots regularly available even today), such a tax would be kind of annoying, but I could easily cover 100k/30 days for my personal house.

I would think that house flippers might find such a tax to be a real pain. Not only would they have to constantly shift funds to their alts to pay for the tax, but every 30 days without a buyer could cost them millions of gil.

Basically, for those in one of the large servers where it seems nothing SE can do with the current system can ever open up enough plots that you can have a shot at home ownership, would you be fine with paying a tax if you knew such a tax made it possible for more people to enjoy housing?