Those heavy volumes have become as obsolete as buggy whips.
I brought my 10+ year-old set of the Brittannica over to the book exchange, and they told me they were "household waste." That set was expensive.
When I was a student, I always looked up every topic in the Brittannica before looking at a textbook, to get the overview. I am lost without a broad overview.
Wikipedia just doesn't do it, no matter how handy it is for our website. You can subscribe to Britannica online.