If I choose to buy 10 years worth of TP, and I have the room to store it - what did I waste? I actually have saved time and maybe money (inflation) as I won't have to buy TP for 10 years.
Same same if I buy anything that is pretty much static and won't degrade over time.
Stupid no, smart maybe.
And if times get tough and there is no zomie applesauce, I can pawn my guns/knives/tools if need be.