Not during p-book era, due to storage issues and coin.
However, I now buy ebooks in batches during a sale, or given a gift certificate. I consider building a healthy stash of ebooks sensible retirement planning. I replace favourite paper books I'll reread, because I expect to be in smaller space. Also, I'll be on a tighter budget, and book prices will likely keep pace with inflation.
This all sounds very rational, and it is, but sometimes I just go overboard
