Comment by pyython

Google runs the largest ad network on the planet. It's absolutely critical to their business model. Wikipedia is great, but they produce no content of their own and lack any sort of curation. Of course there's a lot of crap on the Internet, but I personally find many types of well-curated, professional content extremely valuable. I personally would be willing to pay for much of it, but I'm in a better position to do so than many - which is exactly my point.