Why no Plex system?

[Vaer]

That's what I don't get. How would you expect to buy the sub using gils? The only fixed currency from mog is crysta.
They either allow buying crysta in-game or have an external NEW site special for subscription.

Huh? They sell a mog station item that is tradeable and market board-able. Players put it up after buying it for $15-20 real money for 6 million gil each. Someone buys it. Player that put the token up gets 6 million gil or whatever they want to sell it, player who buys the token can use it and get 30 days sub. Obviously they would have to implement a way for the item to affect the account and safeguards in place so people can't exploit the system but that's about how it would work in the simplest terms.

Anyway that is like if it was not a controlled system. WoW has a special interface and algorithm to handle how much it costs in real time and has very specific restrictions on it (can only get them and sell them through the exchange, restrictions so you can't flip them) but it's pretty much as I said above.