If there is any proof of this last time I checked nobody has bought a house not even a small one.
There may be a lot more people who play on legacy servers which would mean the server has a whole has more gil but for individuals in a free company they probably have a similar amount of gil to other people on other servers. Yes there are some people who have a lot of gil saved from 1.0 but that isn't the whole population of the sever.
We still earn gil at the same rate as all other servers. Gil is created through selling stuff to npcs, doing dungeons, doing daily quest and other quests. All these reward the same gil no matter what server you are on thus making it much harder to buy a house on a legacy server because we have to pay 3x-10x more non legacy servers.
Something needs to be done about this. Basically all the new housing items and such are being ignored because nobody wants to pay or can afford the high prices.