[fbuilesv]

I used a $50 coupon I had lying around to direct people to a landing page for a product targeted towards gamers. Being able to be super specific in the people I wanted to show the ad too was nice and in return for the $50 I got 89 people interested enough in the product to leave their email addresses. I still don't know if this qualifies as successful or not.

[antirez]

a little more than 50 cents for leaving you the email, with some form of agreement that let you send informative messages on your product to these emails, is in my opinion a successful result.

[pbhjpbhj]

Depends what you're selling. If your gross profit per sale, before marketing expenses, is 50c then it's not super-effective (unless you're selling the same person lots of items).