How I got feedback from 200 people for just $17
blog.anynewbooks.com
blog.anynewbooks.com
Another option is to get reviewed by thousands of people through Hackernews, Reddit, Facebook, Twitter, etc.
I love the idea but I'm really hesitant to sign up for such broad categories. What would get me to sign up would be allowing me to enter keywords like:
Physics, Austrian economics, marketing, Ruby, Android, Spanish fiction etc.
I'd be fine with those even if the newsletter only had one book in it or if it came only once every couple months as new books were released. As it is, getting a newsletter with all fiction or programming or science or business books in it wouldn't be much better than sending spam with random Amazon links.
Great idea though and the site looks really nice.
That's why my next big feature is going to be adding the ability to follow specific authors, and probably keywords as well. This way people will have a choice. :)
Also, Go Canada, nice to see another startup joining the ranks from my country. Good luck to you!
A better approach for those 200 people would be to ask them: i) who do you think would be interested in this site and why. ii) What other services are related to this one. iii) Can you tell a source of clients for this site?
Anyway, a crooked sample doesn't allow a straight thinking or inference. The number of people 200 is not related to the 17$.
Anyway, best of luck with the site :-)