^^ and the others . . . . #1 those in beta will have much extra time to learn what is essentially an entirely new class (hunter and rogue the two I play have been totally changed). 3 months of experience and learning will beat 1 month every time. #2 they will know how to LvL fastest and #3 how to do the dungeon mechanics - both of which will given them better gear faster. And given the rnd gear drops that could result in significant difference. And #4 they are all playing together - no-one is playing on live except to do the weekly manno/archy/blackhand kill which we all sleep walk thru at this point. So they playing together in beta and I am not there - not good as far as being part of the team. And #5 I would expect they will do beta raid testing - be very surprised if they do not. RL has said he is planning on it.
You really think all that will not make any difference on who is best geared and best integrated into team at start of live raids?
It would be different if say only one guild/team member was on beta - but when the vast majority is . . . it sucks to be left out.