I'm not naive enough to assume that these sites are popping up to serve the community. They're popping up to make money.
But they also help fill a void in the market. I don't want to (nor could I) go out and recruit my own advertisers . AdSense or others do it for me and that's why they get their cut.
But they also help fill a void in the market. I don't want to (nor could I) go out and recruit my own advertisers . AdSense or others do it for me and that's why they get their cut.