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How come they're not offering large cash prizes for solving these in order to encourage more participation?

Because up until now, it's working just fine without large cash prizes, I guess.

I suppose that depends on your sense of urgency.

Or sense of purpose.

Are cash prizes all that helpful in fostering insight?

I recall a demonstration at TED where cash incentives cause a worse performance, maybe due to pressure.

So if people are showing up on intrinsic motivation alone, it might be good to let that lie.

They seem to have worked pretty well for Netflix and the X prizes.