Some of you might wonder why I bought 7 bottles of bbq when I only needed 1. It's simple, to add to my stockpile. I was able to get each bottle of KC Masterpiece for $0.50 when they retail for $2.39. My store had them on sale for $1 and I had 7 MQ's for $0.50/1.
Items go on sale in cycles. BBQ may not be at that price for another 3-6 months. If I buy only 1 right now, when I need another in 2 months I would have to spend the $2.39, I don't think so. The point of buying multiples is simple, get it cheap now so you don't have to pay for it later...pun intended.
There are many other reasons: job loss, helping family or friends, or donating to shelters.
TheKrazyCouponLady has given us more reasons as well. If you'd like to check them out click here.