The GMs aren't alpha testing, because the GMs aren't QA analysts. That's a completely separate job. GMs, moderators, and community representatives work for the game, not on the game. Otherwise I'd agree with you.

And if the reason RMTs are allowed to play truly is because SE wants the extra revenue, they oughta know by now that they can ban them as much as they want, RMTs will just buy the game again. Therefore, banning them means more money in the long run!