i think of a hoarder as someone who buys in excess in a time of general need..like during WW2 buying 50 pounds sugar and the hell with everyone else..packrats are harmless collectors of stuff and what we have here on this site i would assume to be stockpilers,which are close to but not real hoarders as there is no general need of a scarce item..like gas or sugar.--ok i sort of confused myself but you get my drift..