Not sure if they were just there for ToDs, or if they were buying stones...but I've seen a JP player (Vermilion, usually on WHM, but he has other jobs) hanging with RMT. Always seemed to be there when they killed Ulli.
Once the RMT were banned, their whole LS (Nightingale) was up there competing against us at the same time of day. Seemed a little suspicious to me, since pre-RMT ban they were never around.