Just for fun try this in game

[Yurimi]

I assume you believe RMT is of no concern to you because it doesn't affect you and you don't care if others cheat by buying gil? Are you unaware of the fact that RMT causes massive market inflation if left unchecked which affects EVERYONE on the server?

With regards to the OP: They won't ban an account as soon as they find it guilty of RMT activities as this makes it easier for the culprits to tell how they've been caught and adjust their methods to evade it in future. Instead SquareEnix gathers their names and bans them all at once every few weeks. This is exactly how they handled it in FFXI and it makes sense for the most part.

yes and no... after being active a few weeks the damage is already done thousands or more of items are now in circulation (be it shards harvested items or just gil in general) so the economy is already polluted with their goods

so while it keeps them from changing their tactics do their tactics really need to be changed if they are working for long enough to do the job