The "Yes" and "No" buttons are mailto links?! If you're going to go that route, at least add a subject in the links that differentiate between which button was pressed.
That was a mistake and removed.
I'm not sure making people click "yes" or "no" does anything to confirm an idea, by which I suppose you mean validating a hypothesis for an MVP?
I have similar reservations. The customer doesn't always know what they want. However, would you agree people often can predict how they will behave if accurately presented with a product? To spend 15 minutes to put an idea and a question out there, it could yield quality results for accessing a direction. Especially if A/B testing a screenshot or elevator pitch.
I think Kickstarter or other crowdfunding platforms, where people vote with their wallets, would be a better way to validate an idea.
You are right. But Kickstarters take money and time to do well.