Do you mean that you want to play the full game before its finished and is still missing some things, or are you saying you want Larian to hold off on releasing the game once its finished so that a select group get to have a "private" launch?
Why? Its not an MMO where it will matter if you are 10 levels higher than everyone on your server?
Why would you not want other people to play the game when you first start it up?
(and I'm a backer so I would "benifit" from an early access, I just don't see the point.)