Quote Originally Posted by DoctorPepper View Post
Fact is that they have no evidence to ban the buyers, they simply receive a large sum of gil. People could just claim ignorance and you would have no proof that they actually paid any money for it.
It is a simple matter for SE to trace gilsellers from bot accounts who send large amounts of gil to seller accounts who send gil to regular players. They have no problem banning the bots and the sellers, but they have been reluctant to ban the buyers so far.