>>anm89+(OP)
Yep. Jump in my face, and I'm not only not going to sign up for your newsletter/install your app/whatever, I'm going to actively avoid ever visiting your site again.
Your metrics may show that you get 0.2% signups with this method rather than 0.15%, but they likely don't show the much larger number of people who won't be coming back to your skeevy site, ever.