Just be very careful when it comes to trading and/or dragging mobs to the bots to kill them. While it may be fine for a legitimate RMT, a lot of the times it's just someones personal mining bot. As such, they're going to notice. And if they really want to, they can report you for harassment.

The GMs that handle harassment cases work significantly faster (they respond within minutes at times), and the only thing they'll see when they investigate is the player being killed by someone else through various means, which is a quick way to get the hammer swung in a completely different direction than you hoped to see.