Nope. A few guns, maybe, but not knives. I can always get just another knife like the one I had or one I like better. Having said that, I also tend to buy multiples of the kinds of knives I like. For example, when Smokey Mountain offered the CRKT S-2 (large) w/a titanium frame and a 4-inch ATS-34 blade on sale for $25 (including shipping), I bought seven of them to keep and give as gifts. And just recently I bought multiples of another knife (Böker Plus fixed blade) that's on sale for $29.
With guns I can't afford to do that with, but knives, there are so many good ones out there that I can't carry them all as it is. If you can get knives at a great price, though, and especially if they're no longer going to be made, get several. In our economy, the value of money is going nowhere but down. Knives, guns, ammunition, silver, gold, whatever, and any other non-perishable good will only be going up as your $$$ plunge in value. Also, as money becomes worth less, you'll see more shortages as supplies try to keep up with demand.
Besides, before this is over, the government may own the knife companies. Isn't that a [shudder!] comforting thought?