Indeed, there are many folks doing this very successfully. It's certainly not for everyone though, and does require a bit of work. We actually work with a bunch

Indeed, there are many folks doing this very successfully. It's certainly not for everyone though, and does require a bit of work. We actually work with a bunch of folks who are doing this successfully over at a side-project of ours: http://syndicateads.net http://syndicateads.net