Most people are going to read that "Supper forty-two" and not "Supper for two" and as such I think the name is worth less than registration fees. It would need to be SupperFor2.com. I don't even think Supper4Two.com would really work for that idea either. If you list it somewhere, be sure to indicate that it's supposed to read "supper for two" and you might hook a buyer in. Good luck!