Crowdsourcing works in cases where lots of customers are interested in the same set of attributes to extract.
But by definition, customers interested in long-tail attributes (i.e. virtually all of them) don't have others to source those from.
But by definition, customers interested in long-tail attributes (i.e. virtually all of them) don't have others to source those from.
It would also lower the barrier to entry and thus increase the size of the market. Imagine if the first X sites I tired all needed more work. I'd likely quit. But if that didn't happen, I'd more likely continue.
Crowdsourcing isn't The Answer. But it's certainly a better step in the right direction.