This is true...but...we're talking about glamour/mounts/minions here. If the department responsible for these things have a constant stream of work for making these items for the sake of an NPC that gates them behind a wall of gil, we'll get them work less on those that are gotten through dungeons, raids, trials and similar more accessible content. And all that for a system that's flawed from the beginning and is asking for promoting gold-sellers, cause you know, the average player will never get that amount of gil without buying it. And people will be more inclined to do that, unlike now, when there is not that much content that is really costly to the point of being unachievable for the random guy.
