Spam is good emergency food for protein. I would not make a habit of incorporating it on my diet otherwise.
I have built a shef unit in my basement where I've started to stockpile things that have shelf live, mostly canned food, but I actually don't have spam. I have tuna, salmon, sardines, beans, corn, and several other things. But I will probably also buy some spam and keep several around.
It's only a matter of time until the next event happens and this is the time to stock up on things while they are available. I have thought of buying a dehydrator to store some fruits and vegetables as well.