Here is a nifty little bug that I and a few guild mates figured out.

We have tried this outside of AV and so far haven’t worked

But inside Alterac Valley battlegrounds.

If a priest mind controls a player, cancels the mind control, and another priest mind controls the player again. While that priest is mind controlling, the other priest opens a trade dialog with the priest doing the mind control. normally this would result in a "player is busy" message. But not so while the trade window is open, trade X gold to the priest mind controlling the opposing player. Complete the trade. Cancel the mind control. Now the priest that was mind controlling has X more gold added to their stockpile, while priest who initiated and traded the gold...LOST NONE!