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Another post with a similar line of thinking, on testing for paying customers:

Mark Suster - Why You Need to Ring the Freaking Cash Register

http://www.bothsidesofthetable.com/2013/07/16/ring-the-freak...

Perhaps you've seen this too, about discovery of interested populations of potential users:

Paul Graham - Do things that don't scale (July 2013)

http://paulgraham.com/ds.html