Well, I heard some guild is farming lots of MVPs with bloody branches, which is suspect (due to the possibility to get them)but its acceptable.
A few days i heard they were farming MVPs who doesn't exist in the game yet (bzb, fallen bishop...) and yesterday I saw their drops in stores @ prontera.
How does it work? A few players are playing on patch a and others on another?
Well, I just hope one day I won't face a 3rd class on PVP/WoE/MVP.