This isn't a thread complaining about the housing prices, but rather to analyze the effects of the massive gil sink of housing. Currently, I believe the flow of gil into and out of the economy is in a good state. Repairs and taxes from the market boards are the primary ways of getting money out of the economy, and dungeon runs and leves are the primary ways of getting consistent money into the economy.
Now when you look at the price of housing, tens and hundreds of millions of gil, there is really no way for that large of an amount of gil to be inserted back into the economy. When you look at the long term effects that these massive gil sinks will cause, it doesn't look good at all for the future of the economy.
Just as a reference, the state of the Balmung (Legacy Server) economy is in a very bad downward spiral, things cost 40-50% less than they did 2 months ago, which makes earning millions of gil very very difficult due to the fact that there is no demand at all for anything.
All of this on top of the fact that there is no way for a Free Company to earn gil outside donations or titan runs, this is not a way for a Free Company to earn gil. Taxes and Free Company level assets which generate income are a much better system to earn gil for the Free Company rather than "Hey guys give one guy gil so he can buy a house for us!"
So how do you really earn 625 million gil? The answer is, you don't. In order to make money, there needs to be a demand for something, currently there is little demand for anything. Crafters make money by selling things to other crafters, so they can craft more things to sell to other crafters....
All the new crafting items they are adding won't help at all either. Lol-PVP gear, and housing furnishings are the only new things being added really. Housing furnishings, for houses which no one can buy because they are so expensive no one can afford them....
SE Really has no idea how an economy works. Seriously, take something from EVE Online and hire an Economist to analyze your game economy. Then they might finally realize how terrible of a state the economy is currently.