As far as I know, to get an EDU email you just need to find a college or university with open sign-ups where your application nets you an email address with them. Is this method any different?
No, you are right about this. However, not everyone knows how to do this.
Personally I think my price is right. I see people selling .edu emails for $2.
I see what you are saying, although I am not quite sure what you are selling then, since from my perspective that is really all you need to do. I know some others have also sold these methods along with macros or scripts that do all the work for you. Is this included?
Otherwise, the way I can see you actually selling something good would be selling the actual domains that allow this kind of sign-up process, since those aren't exactly easy to come by.
I see some people asking for vouches above. I have vouched for this kind of thing many times before (feel free to check my post history). If you need a vouch, just hit me up with a PM.