I doubt they have only three people on that team. I would more believe that the three people in the credits are the department heads. Also, there is no way to stop RMT without removing trading from a game. Period. FFXIV is the new trendy game, so they flock there to get as much business as possible. WoW had a similar problem during BC and Wrath but died down because the game started to suck. The only difference between FFXIV and WoW is the addons that the community made that blocked 99% of spam tells, and unfortunately blocked a large amount of legit tells.