That's why I'm so sad when people view my inability to get to email in a timely fashion as a proxy for my interest or the type of person I am.
I just get a ton of email and it's impossible to respond to it all, much less in a timely fashion. I'll try my best to get to it all, but if for some reason you haven't heard back in awhile try again and again. If nothing else I'll notice your determination and provide some feedback.