The no grey area is an interesting idea. As a crafter, I was hired to do some crafting. I charged 500K/armour piece. the person I bought from then later said they needed to buy more gil in order to pay me for more pieces. I Blacklisted the person, so that I can afford to forget the persons name, but I was definitely concerned. That player paid RL money, <for gil or services> and then I provided the service (For the gil)

I felt like it was a gre area for me, but seeing as how I was unaware originally I hope SE won't include me in any future temp bans. I am only aware of being handed RMT-purchased gil the one time. Even then, the person COULD have been trolling me to get me to do stuff for free.