In reply to Trangia:
I think it depends on how you came across it. In my opinion anything that is in the rock because it's 'stuck' (being a lose term if you can get it out of course
) or if someone's retreated and not gone back for it is fine and the price makes a difference. There was a story not so long ago about a guy who had an accident in the cairgorms and left an ice axe on a route and the next people got it back to him