Don't know if this is the right forum but here goes... This site has 6 ad blocks for sale, he charges 10k a month per block with 50k hits per day on the site. He is doing this through an ads broker, but is it possible to do this on your own, my question is how would you find the ad purchasers?
You can sell adblocks on your site, i guess the reason why many is using adsense is becuase finding the right purchasers takes to much time. You can always start with putiing a link to a page "Ad on this site" with your contact details, so if someone would like to pay for a adblock, they can contact you and they know it is for sale
Oh yeah of course, but what about actually chasing potential advertisers, is that a good practice or is it just a waste of time?