I started a few bans sites in january 08, have made about 300.00 so far with minimal and some organic traffic. but i decided to amp it up a little with a few more ads to see what would happen and 1day, 10 ads, 228.00. not much i know but i could probably get 3 to 5 times that if i do my ads every other day. I know a pretty reputable guy who was struggling a little with free methods and bum marketing and decided to get bans. He put up 10 sites and started following a marketing plan from somone at the bans forum, to make a long story short, 6weeks, made a little over $10,000.00
This guy was so amazed, he was afraid to really let it all out till he deposited his cj check, which now he knows his way around the block as far as making sure he doesn't compromise his cj and ebay affiliation with some old school and simple black hat tactics. Since then I know he was on his way to building 40 or more sites. I know it can work, I've had about 50 sales, just wish those were info products with a 50 dollar commission. Anyways, It can and will work and is a pretty nice addition to the mix of things, but this guy was bans all the way, which im going to be putting in more effort on mine for sure but probably using more natural ways to stick around a little longer in the search engines. Posting ads everyday per however many sites can get a little wearing.
Anyway, hope that helps some.
by the way, wish i could use extras avatar as my screen saver, lol