I can't speak to the scarcity of it since I was just a kid and ate what Mother served, but I remember eating Spam quite well. In fact, it was a favorite of mine. We continued to eat it after the war, too. Then I grew up and went off to start my own household and somehow or other, Spam got forgotten. One day, years later, I happened to spot it on the shelf in the market and I thought, "Hey! I haven't had that in a long time!" So I bought it and went home and served it for dinner. Well, I guess tastes and/or habits change over the years without even realizing it because that Spam was sooo salty I swear it made my tongue raw. So, no more Spam in my house. Someone told me, "Oh, they have low sodium Spam, now." Thanks, but I'll just stick to fond memories. But as a side note, has anyone been to Hawaii? Those people had to eat Spam during the war and never gave it up. McDonald's features Spamburgers and those people really lap it up! 
Oh, well. Whatever makes you happy. 
Marilyn