[NeilRamp]

Yes, surveys are low quality. But personally I find that if they're well designed then you'll get more data out of them than you would a sign-up page. And there are always plenty of people out there who are happy to do an anonymous survey, but not give you their email address. Sometimes that's the best data. You would miss that with asign-up page.

[randomsearch]

If they don't want to give you an email address, they don't care about your product. That's great feedback that the hypothesis is wrong.