This is a fairly decent way to handle RMT. it's effectively removing 90% of gil from circulation. most of which is probably on RMT characters.

The economy right now is way out of alignment right now anyway. the majority of the gil I make comes from NPC sources. the majority of stuff I buy is from PCs. I'm pretty sure a lot of other people are the same way.

So no gil is really exiting the system. there is also not really any gil sinks to remove money from the system. (and by that I mean things that require you to give gil to NPCs) the biggest one right now is the taxes on the wards. easily remedied through trading.

I personally think this is a good move. This is a classic example of why some people need other people to make their decisions for them.