Im building a email list off of my blackhat ppd niches, so im not sure how much quality it is and my popup is somthing like "join our free offers club". So it is single opt-in. If somone could explain to me the benefits of double-optin to single-optin im just curious. But my main question is what is the best way to monetize this list if anyone has any experience with it. I was thinking either clickbank or cpa offers and setup a email responder im getting about 30-50 emails a day.