I'm curious if there are any folks here who have used something like adwords to take an ad out about a niche and had people land on a "pseudo" sales page - a page selling your product before the product really exists to see if anyone is even interested in the product before you make it. If you do I'd love to hear your experience. Like how long did you spend on the sales letter. Did you just use an email capture form or did you make the page really pretend there was a product behind it and encourage them to click an "add to cart" button. Etc. Any other advice worth sharing?