You could be right Mrs.M, and I'm sure it's done all the time. (in fact my check is in the mail for something now). I won't be telling eBay about it though.
Basically, eBay says you can't use eBay resources to make a sale without giving eBay their percentage. (sounds fair) Is getting contact information from an eBay sale, using a resource? Unfortunitaly, that decision is made only by eBay. I think I know what their answer would be. It's not against the law, but think it would be against eBay rules.... at least that's my read.