I grew up on a farm in southern Minn. It was a dairy farm, but we also had some beef cattle and hogs.
We often took our hogs to the Hormel plant at Austin, MN. They had a water tower that looked like a big spam can. I'm sure some portion of our hogs ended up as spam.
We didn't buy spam, because we butchered hogs and beef for ourselves (and relatives). But I've had spam many times since I left the farm, partially because of the sentimental value.
My favorite way to have it is cooked in a cast iron fry pan over a camp fire, with eggs.
I've made it at least 2 dozen ways, and bought almost all of the flavors of spam.
I don't buy it any more because it's not economical any more.