I am sure they did, but they also, at least on Cactuar, charged astronomical prices for a long time for what they were making. Prices.... that a new 50 should not be able to legitimately afford based on the amount of gil entering the world via questing. They obtained illegal gil in almost every case from players who bought gil from RMT. Since within that first month before repair prices were fixed and mobs dropped more than 1 to 2 gil there was only so much gil entering the economy.
So yes house prices are screwed hugely from illicit activity from RMT regardless if they are holding tons of gil atm (which they are) but how much gil they put into the economy since launch from people buying it and spending it.