Think about the original question...the word "backup" came into play. If something happened to the main one would you want to have to fall back to the "cheap" one? This is of course assuming there was no longer a supply chain from which you could source a new metal one. But what does that world even look like? Is it because a ban has prevented the manufacture and sale of new ones? Or because civilization has fallen? In either case wouldn't you rather have a backup that's at least as good as a cheap Anderson or PSA metal one?