Most people, most of the time, aren't creative, generous or willing to stand up and contribute worthwhile work to the community. At least not the contributions you're hoping for.
The myth of wikipedia is that, when given the chance, hordes of people stepped up and built it. In fact, 5,000 people contribute most of the value on the site.
The myth of ebooks is that now that anyone can publish, enormous numbers of people will use this new platform to create countless numbers of new classics. In fact, most self-published ebooks just aren't very good.
And the same is true for just about everything that's open. A few people do an enormous amount (non-profit volunteers, community organizations, online sites), a few people are vandals or merely taking what they can take, and the masses participate, but aren't at the heart of the project.
To dismiss the crowd is a huge mistake, though.
Here's the fascinating part, call it the golden shoulder: We have no idea in advance who the great contributors are going to be. We know that there's a huge cohort of people struggling outside the boundaries of the curated, selected few, but we don't know who they are.
That means that the old systems, the ones where just a few people were anointed to be the chosen authors, chosen contributors, chosen musicians–that system left a lot of people out in the cold. The new open systems embrace waste. They understand that most people won't contribute and most contributions won't be any good. But that's fine, because this openness means that the previously unfound star now gets found.
The curated business, then, will ultimately fail because it keeps missing this shoulder, this untapped group of talented, eager, hard-working people shut out by their deliberately closed ecosystem. Over time, the open systems use their embrace of waste to winnow out the masses and end up with a new elite, a self-selected group who demonstrate their talent and hard work and genius over time, not in an audition.
Go ahead and minimize these open systems at your own peril. Point to their negative outliers, inconsistency and errors, sure, but you can only do that if you willfully ignore the real power: some people, some of the time, are going to do amazing and generous work… If we'll just give them access to tools and get out of their way.
(The curated block isn't reality, it's merely what the curator claims–that his magical powers will find all of the great talent, without error or waste. Of course, a quick look at Hollywood or even an expensive mutual fund shows that this is a fable. The 'open' block includes the low-quality stuff as well, but since that work is created without a lot of expense, pruning it is no tragedy. The secret is embracing the talented and dedicated people who choose themselves.)