So this will get me testers who are into testing alpha websites?

Pretty cool. But it doesn't really strike me as being useful for domain specific websites.

- Appointment Reminder is probably far more interested in Joe the Plumber/Hair Stylist/Auto Mechanic then me.

- AirBnB could care less if I don't like it - I don't travel enough.

(Comment: If you could get me domain specific users I would pay you.)