Validating an e-commerce idea with email sign-ups?

Success has a lot to do with your sense of being Find out how to train yourself to make money and stay in tune with your mind, body and soul

I'm reading a lot about validating ideas by using ads that lead to a landing page and an email sign-up. That makes sense to me but I'm not sure if that's a good tactic for an ecommerce site?

For example, I don't see how a bow-tie store with a landing page that basically says "coming soon sign-up now to be notified when we launch" would get many conversions at all.

Am I wrong here? Is there another way?

P.S: If you are interested in making money on-line, there are many avenues you can explore. Click here to get my step by step guide on how to this. I break down all the details for you and give you some useful resources and tools