According to discussions on Amazon.com and Goodreads.com, people buy books, but rarely read them. I happen to agree, partly. I buy books I've already read and loved, usually from the used book sale table at the library.
Occasionally I'll buy books (or borrow from friends) for my children, like this and this, because the hold list for them is too long. But there are so many book series similar to these books just waiting for you to pick them off the shelf (your librarian can help you find them, like this and this), that it makes more sense to borrow.
I read most of the books I borrow because I know they aren't mine. That three week time limit does something magical. Borrowing also gives me the freedom to take risks, to explore new interests without regret.
My personal experience is if you library, you'll read more, both on your own and with your children. The library specializes in helping us share more and spend less.
Borrow the beauty, keep the knowledge. Library.
How about you? Do you read more when you buy, or borrow?