> If it can't tell you if an idea is good, and you can't trust it if it says the idea is bad -- what is the point, again? The point is not to prove the idea is

> If it can't tell you if an idea is good, and you can't trust it if it says the idea is bad -- what is the point, again? The point is not to prove the idea is good, but to prove that the idea isn't bad. In other words you can't prove that email addresses will convert to sales, but you can prove that no email addresses will convert to no sales. It's useful to know if your idea will produce no click-throughs, which will produce no sales.