Proof:
http://imgur.com/I89Pt7c
http://imgur.com/aEDxguc

How it works:
The gil-sellers hack the terrain. They position themselves in walls, under the ground, and invisible (you can't see their character models, period). This prevents them from being interrupted or getting agro.

The next step is they bot/macro the nodes. I'm inclinded to believe it's a bot as opposed to a macro, given that they are on around a 20 second timetable per 4 nodes.

Furthermore, they teleport between nodes instantly. I'm not even sure how they manage that one, but they're legitimately insta-warping between nodes to maximize their time spent farming vs. walking.

This screen is from Central Thanalan, on the Ultros server. I'm sure you have these same types of people on your server, cheating the same way.

SE, you better get your **** together; this kind of stuff ruined FFXI, and if you don't seriously crack down on it, it's going to ruin FFXIV too.

Please *UPVOTE THIS POST* if you're seeing/witnessing/experiencing this sort of rampant cheating on your server too!