Let's go ahead and make it $30 additional per month and add a $40 one time item purchase on the mog station called "Ishgard Residence Permit" that you have to have too.
It's profitable, people will pay for it (even if you would draw the line there personally), it'll allow them to magically bypass the "limitations" so why not do that?
More real life wealth inequality brought into the game is a nice thing after all!