Depending on who hosts your content, these sites are fairly cheap to make and maintain. I have a few friends who make these sorts of websites and use imgur and

Depending on who hosts your content, these sites are fairly cheap to make and maintain. I have a few friends who make these sorts of websites and use imgur and other free services to host content. They cost on the order of tens of dollars a month. As for profits just look at their visitor stats and compare it to adwords.