if you have a billion dollar idea or even a million dollar idea, you shouldn't worry about "burning" contacts. You'll have plenty of other people to test with.

If people have enough of a pain point, they'll happily use a google doc. Look at Craigslist. It's god-farking-awful (worse than a google doc), but people still use it to find apartments...

Let me ask you a question. What is the number one thing you need to test to prove the viability of this idea?