You don't have to gap them, they come pre gapped at .050. They are just cheap because they are copper core plugs.Cause they are copper, which I am pretty sure its a better conductor than platinum or whatever stock plugs are, also better conducter than iridium if memory serves me correctly. They are cheaper cause they don't last as long, probably copper is cheaper, and another thing you have to gap them yourself.
I was told by a machanic to change your plugs every 2 years. And when you put new ones in put a small dab of Anti-Seize on the threads.ah that makes sense. I still dont see why people need to be replacing their plugs unless for some reason they suspect they are misfiring. reading threads like these makes me want to jump out and replace my plugs, but I can't see a good reason for it. I guess I could take my plugs out and see how foul they are.