Cragslist

According to a website, cragslist income is expected to rise by 22 percent this year, mostly from sex ads according to the Advanced Interactive Media Group, which has been tracking the classifieds since the last 7 years.

It furnished estimates of sex-ad revenue, which it based on the total number of ads counted on Craigslist during February month multiplied by $10, the fee for these sex ads

Source: http://www.merinews.com/article/craiglist-craigslist-gets-most-revenue-from-sex-ads-listing-of-prostitution/15805278.shtml