Maybe for those who have some mild to moderate psychosis. Otherwise I see absolutely no comparison to hoarding. Hoarders keep everything...just for for the sake of keeping it or because they can't bring themselves to throw it away. Most hoarded items have little to no value. There's a big difference between an organized, thought-out collection and an accumulation of 700+ empty Bic Mac cartons. I seriously doubt anxiety has anything to do with for 99% of knife collectors.