I'd never leave something behind, especially if hard earned cash went into getting it. I respect my things, and would never expect anyone but myself to replace something if it got lost/damaged or stolen.

Kids that think "Mummy and Daddy will get me a new one!" make me sick. What are you seriously going to do when "Mummy and Daddy" aren't around anymore?

Fair enough, if you leave behind something you don't need/want anymore, then by all means do so. It would be nice if it was given to the right person though...