If you can find 10 people (or 5 people who all want 2 each), then the bulk pack is a better deal. But I only needed 2 (P-38 on keychain and P-51 for kitchen) so I only wanted to spend $2. Spending $5-6 when you only need to spend $2 isn't technically spendthrift. If one only needs 1 and can make sure it doesn't get lost (and that happens) then maybe get two. I put the big one in a AA battery holder, then that goes right into the utensil tray, so it doesn't get misplaced/lost.
I use the P-51 on those oval sardines cans or those strange shape cans those big can-openers doesn't like for some reason.