When offering anything for a sign up.....
Be honest and upfront in whatever you are selling, promoting or giving away. I just had another experience with some dork who pulled this. So the person who recommended this to me now lost me as a subscriber and the one who got my email to begin with got an earful and lost me right away. Shady business practices have no place in real business
***Edit: Remember that people who sign up for your offer are potential customers which is the point in building a list just because one may not buy the first time doesn't mean they won't the next time. Customers folks it is all about the customer!
-WD
"As a man thinks in his heart so is he-Proverbs 23:7"