If I want general knowledge, I prefer Wikipedia. If I need to delve into a specific topic, I'd rather read a book or three (by people like those, and others).

Having a collection of great articles on a dozen random topics is not really helpful, since the probability that I'll want to learn about those specific topics is low.

This is the Internet age. I'm not interested in having a poor man's library taking space on my shelf, when I can access the world's.