The conversation has come up that I could gain some funds by running advertisements on the site. However I never liked the online advertising and how it works. You can add in the potential attack vector of Malvertising (malware in advertising) and see why I remain on that stance to not be on an advertising network.
Ad network exploit vector write-up.
This is also why advertisement and javascript plugins are a really good idea. If you have not done so before, install NoScript and see how many 3rd party domains are accessed when you go to your favorite websites.