They are doing this for a few reasons, mainly I'm guessing it's to do with the amount of servers they have so they want to limit it till they have more servers in place. The other is obviously the massive amount gil certain players have.
My real gripe is why put so much effort into making this feature if only a small amount of the player base will get to try it out. There is a ton of more pressing concerns that could have been added this patch over something hardly anyone will get to use, and saying in 3 months it's going to be cheaper so try it then only backs up why did they not add other features over it this patch, it's still insanely expensive even at half the price.