Untaxed income is better than the other kind. Having lots of TP is a more satisfying feeling than I had ever imagined. Corn weevils are a real and present danger. I do not trust my neighbors with my family's lives. Scrap rags are extremely useful items, and worth keeping.
Tin cans are versatile, useful items, and definitely worth keeping.
Almost everything is worth keeping for one reason or another. The vision of your loved ones dying is an incredibly strong motivation. Modern medicine can be supplemented or replaced with traditional medicine more times than not. Penicillin for sheep is identical to penicillin for people. Spiders are desirable in the garden.