Your blog visitors will be subscribed to your email address list.
Use with your email marketing provider like MailChimp, Aweber, Klick-Tipp, GetResponse,
MadMimi, CleverReach, Rapidmail, Benchmark, ... Your blog visitors get a bonus for commenting -> more comments ->
more SEO content for google -> more new blog visitors in your blog. Blog visitors love to comment to get the bonus.
After writing the comment the user get an confirmation email. Subject: 'One click to get your bonus worth 29,95 Euro'
The User confirms the email address and that he wants the bonus. With the first automatic email the subscriber get the bonus.
That is a win-win situation: The visitor/subscriber get the bonus and you get more comments/SEO content and a confirmed email address.
You can use the emails address to sent 80 % Information and 20 % product offers. So you can grow your list and the possibility to earn a recurring income.
Some internet marketer say they could make one thousand euro out of one thousand subscriber in a month.
Just imagen how great this could grow.