Point taken, and it seems to be a common thread. We need to think about how to do this better.
The reason we care about registrations is because we look at it as a community not a marketplace for content.
Building a bad community, not setting precedent, training up people and solidifying a culture are pretty lethal to your stated goal.
Once you are open to all, your constant battle will always be:
1) Not let the Signal to Noise ratio degenerate 2) Be able to split the Signal down into sub categories for people to process, as opposed to a torrent which then leads to arbitrary discarding of significant data.
With regards to managing signal to noise: 100% agree. Figuring out how to slice and dice the content so that you see what matters to You is our number one "tactical" objective. It is actually a hard problem, but one that gets easier as you come to understand the content being created and once you can benefit from enough liquidity to slice and dice at will.