In my .02 cents spam is a great survival food, depending on circumstance. What I mean is, if you plan to haul cans of potted meat around in an INCH bag, probably not such a good option. But, a can or two in a 72 hour kit wouldn't be a bad idea at all, in an emergency you could probably even use the can (after you eat the spam) as well for different tasks such as collecting or boiling small amounts of water or in a really bad situation maybe even cut it up into lures, fishhooks, arrowheads, etc. I consider spam and similar products to be more of "bunker food" not really backpacking food. Something to consider is the outrageous salt content, which could be good or bad depending on your circumstance. As far as flavor, if you are truly in a survival situation, it will probably taste like the best meal you've ever had, even cold out of the can. A few days or a week with no food, and most people would probably find themselves willing to do things they never thought they would, for a can of the mushy goodness. Just look at Venezuela, where starving citizens ambushed a livestock truck and robbed it in a frenzy on the side of the street, around the same time zoos and horse stables were raided for the animals meat (ill put links at the end of the post). As I started with, this is all just my opinion, but I wouldn't hesitate for a second to stock up on spam or other potted meats, if I planned to "bug in", or have an offsite base, vehicle, etc. I just wouldn't want to hump it over long distances in a pack. There are better (albeit often more expensive) options for pack carry, but there's cheaper options too (I swear by those foil tuna packs). As has been said already, spam is pretty decent when fried, especially when served with rice and/eggs. To sum it up, I would evaluate my plans and what scenarios I am attempting to prepare for, before deciding to buy 100 cans, but for simple, typical, short-term survival (power outage, hurricanes, etc.) it's a gold standard. I have about 25 cans in my storm cellar (along with a lot of other food) that I rotate when it gets close to its expiration and the extra makes decent bait and excellent dog food for my spoiled dobermans.
https://www.google.com/amp/amp.dail...g-people-raid-a-truck-full-of-chickens-video/
https://www.google.com/amp/www.inqu...-country-faces-acute-shortage-of-rations/amp/