Well our company generates revenue from advertising, but I'm afraid that I don't have any monetary figures to give (entirely different department than mine). All I can say is at 1st it probably won't generate much. Ad rates depend on the popularity of the site to an extent, so if it's a new site, you'll have trouble finding advertisers. Once you can show them a considerable hit rate, that would change, and if the site is popular enough, they'll contact you.