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It's a great question. I don't have data on that, so I don't really k. As a long term thing though - if/when the site scales to billions of users, a wider group of individuals (dolphins and minnow) are going to be able to do a much better job evaluating quality than having a small handful of ~50 users doing all the evaluations and decisions themselves.

That is true. I doubt 'quality' was the leading factor when they voted anyway.