You are missing the forest for the trees. It doesn't matter how much gil a person has, if said person did not already own multiple houses across multiple characters on the same server before the newest restrictions went live then, as of 6.0, they only get one personal house on their server. Its not really worth wasting your lone personal plot on an alt that your main cannot easily take advantage of so alts buying houses will not be a trend unless we're talking shell FCs.
And thats a whole 'nother issue.