I think it has to do with when we were first married 36 yrs ago and I did't have much money for groceries. I would scrape the jar to get enough mayonaise to send on DH's sandwiches for work and I eaked it out to make it last. So now I won't throw a Miracle Whip jar or peanut butter jar away until it is scraped and I do mean scraped clean. I can certainly afford more Miracle Whip but it is an ingrained habit.