I think you'd have a better reaction if you allowed some public repos to be viewed before handing over the keys to the castle, so to speak. Even better would be allowing a public repo to preview itself via better-hub.com/{org}/{repo} would be slick. Expensive for you, but might help onboarding. As it stands, the call to action is poor, so unfortunately there's no way I'm going to login with GitHub and give a bunch of permissions to a new app posted on HN, no matter who built it.