I've not hidden caches yet but as a newbie I really don't think it would bother me if someone just pretended to find my cache and didn't log it. They are just playing a different game to the one I am playing and I don't really get the point of their game, but I don't think it detracts from mine. Someone stealing my trackables, or stealing the caches does detract from my game. Those behaviours bother me. The idea of armchair cachers I just find a bit odd.