Gilsellers exist because people buy Gil. Powerlevelling and Paid Progression / Merc-ing exists because people pay others to do the work for them.
This is a cultural problem, root and branch. If nobody paid for Gil / Services, RMT would disappear from the game.
What FFXI has now is two Parallel Societies. Some of us have refused to take part in the RMT and the botting. We live alongside the corruption and the filth, but we refuse to join it.
We know who are Our Guys, the people who don't use 3rd-party-softs, the people who don't buy Gil, etc. and we play exclusively with Our Guys. We have broken away from the corrupt clown circus society, and we inhabit our separate and parallel society. It is very nice.