> I would gladly pay for an encyclopedia written by actual experts, I see a tremendous value in something like that, but alas the market was killed by the free Wikipedia.

There are definitely pros and cons. My wife is a professional musician and teacher so at home we have a copy of the "New Grove" encyclopedia of music, which is the industry standard "proper encyclopedia" for music. Each article is written by a specific expert in that subject, This leads to them being tremendously detailed and informative. The downside is the process of compliation is slow and so even if you have a subscription to the electronic version it will be behind (sometimes years behind) the very latest research.