How many ads would it take to fund Wikipedia's annual expenses in full?

Obviously, it's hard to guess how many and what type of ads would be required to cover their expenses (which are $50-60M / year currently). But, from the FAQ:

quote:

---

Why doesn't Wikipedia use ads for revenue?
We do not believe that advertising belongs in a project devoted to education, and one that is driven by the values consistent with a balanced, neutral encyclopedia. Our big, global volunteer community (the people who make Wikipedia) have always felt that advertising would have a major effect on our ability to stay neutral, and ultimately ads would weaken the readers' overall confidence in the articles they are reading.

The current models for web advertising are also not supportive of our views on user privacy. We do not want to deliver ads to users based on their geography or on the topic they are currently reading about. Contextual advertising (similar to geo-targeted advertising) reads the content you are viewing which goes against Wikipedia's strict privacy policy for users. We respect your right to online privacy, and bring you the knowledge and information you are looking for.

We are not against the world of online advertising, nor are we against other organizations that host ads. We just know ads are not an appropriate thing to find in a project devoted to education and knowledge – and especially one that strives for balance and neutrality.

---

The big beg banner is kind of annoying, but I like the way they do things.

I have donated annually for the past six years, so I get the e-mails when I don't donate fast enough. I use Wikipedia almost daily. I'm just saying the begging is a little over the top sometimes, and I wouldn't mind some unobtrusive ads that might even cover not only current expenses, but also some additional innovation efforts.