A box of #4 finishing nails has occupied space in my shop for at least 30 years. Yesterday it saved me a trip to the store! Was it worth it, not really. But the number of trips the misc hardware collection has saved has definitely been worth the space. But almost never have I bought supplies on speculation, only for a specific need. I have brought home found and gifted stuff but stuff has to be tossed sometimes. Keeping control of the shop is a delicate balance.