No gil payments, probably poetics or some other currency or credit that can't be purchased with real money since people wanna tie home ownership to owner activity. And anyone with access to the property can pay it in full or contribute a portion for the week or month, whenever it's due. This shouldn't be much to ask of active players. Owning a house is such a privilege in this game there should be some kind of commitment tied to keeping one. Call it tax or whatever.