To me this is the path to hoarderville. I come from neat hoarders but hoarders none the less. My Grandmother saved every butter bowl, cottage cheese container, cool whip container, styrofoam meat tray, pot pie tin, etc, etc. And we're not even going to talk about my Grandfather's epic junk piles.
It has taken several years of concerted effort, "they'll make more, I can buy it" to stave off the hoarder tendencies.