Looking at BS point of view: Should I let a new forum member in with no or very little post and no way of knowing if they will actually beta test, and may just want free DLC or should I let a active forum member in who has reported bugs in the past, and is involved with the community?
Not really a hard choice, nobody is saying new members won't contribute... but it more of a chance that they wont.
But on the hypothetical that you didn't have 400+ posts and were new to this forum, you'd be stating that it's bull. The main reason Bethesda used the more in-depth beta sign-up was probably to get a diverse group of testers, not just people that have powerfapped their way to level 230 with over 1,000,000,000 hours of game play.