Ruben, that link is actually the main site registration and not the affiliate registration. Jake needs to finish the integration between the two so I've removed that registration link for now. The Sign Up link on the affiliate page will now take you to the proper registration area.
I'd just like to say that one of our affiliates has already referred enough people to us that they just about have their own hosting paid for. So, this one definitely seems to be working well for those that sign up and promote it.