Not entirely convinced on this idea, lol. It would "restrict" the ability for people with more than one computer to join. So you limit the number of points this contest could bring, as well as giving those with an i7 a better chance to win either Group1 or their Group2 subgroup. Hope that makes sense.
It's good idea although I think it may not be suited to this contest in particular. New recruits is definitely the aim. But by crediting a recruiter it would be more about about a person's social networking abilities rather than the work done by each new member.
Sorry I'm not trying to be dismissive of anyone's posts, just trying to make everything as watertight as possible. I'm a little tired so correct me if I'm being sloppy
