If you're a fan of the game, wouldn't you want gamesas to select the people who they trust have the mindset and background to develop the game into a succesful one? O_O
Implausibly altruistic vision of the world as it may be, but come on, let anyone pay themselves into the beta, and the end product would be much more likely to become a bastard child, created by curious people with little to no affection for the FO universe. Just a need to get the "Achievement" to say "I played beta! \o/" for the 2 months they bother to play the game they screwed up horribly.
By no means am I saying the majority of the players here would do that, but.. the idea alone is haunting