I like to have extras for people to use/borrow, plus I bought a couple replacements when my original copies started to fall apart (the 6E books and the 4E books had that in common--a problem with the binding coming unglued). Personally, I'd love it if my players would have bought copies for their own use, but as it was I had to practically drag some of them kicking and screaming into the light of HERO... They're smart people, good gamers, but they have a tough time grokking the way the game works.