When I moved in 2006, I gave away my set of Encyclopedia Britannica to a neighbor. 1957 edition with the dedicated bookcase purchased at a yard sale for $15 in 1989, just because 'Wow' and its own bookcase and some things don't go out of date. There's no Kindle edition of the '57 Britannica and if there was, it would not be $15 to me and free to my neighbor.

These days, my culled books go to a local charity's thrift shop or to Habitat's ReStore or to my public library for its book sale or to someone I know. Not the bitbucket.