One issue I was conscious of while reading the description: I'm not sure the intersection between the early adopter cohorts for different markets would be very large. There is a certain mindset involved, sure, but people need to also be passionate enough about the subject or pain point to bother with bleeding edge products.

If you try to just sign up as many people as possible who self-identify with the early adopter mindset, it may take a while before you have broad enough coverage of interests in that audience for it to be useful to startups outside the core "tech for techies" market.