In XI, I reported people for RMT whenever I came across them. These were ones who bragged in party chat/linkchat about it, and always had the 'best' gear after changing to a new job and then 'miraculously' getting to level 75-99 in a few days due to either power leveling or being in a leech party in Abyssea. If someone I knew irl was buying gil etc, I'd still report them for breaching the ToS we all agreed to when we first signed up to play.
In XIV, I have reported FC members who have bought gil. The rules are there for a reason and even if my best friend was buying gil (She doesn't as she shares the same view I do about this), I'd report her and she would do the same to me if I was buying gil. True this is just a game, but others get gil the legitimate way... while some want to get the best things as fast as possible. Yeah, there's somethings on the MB I want even now... but not gonna sink to RMT.
Just my opinion...