Single here also, I buy things like Folgers coffee, paper towels, trash bags, dog food, and non perishable goods. Their frozen fast food is killer. Their fresh meats and produce don't work for me because they are perishable, unless you want to freeze a lot. Would probably go bad any way in my case, for such bulk items.
Not to mention the gas, optical, tires, clothing, and car and home insurance. I have an executive mebership which takes a 1% discount on hard goods, not gas though. I bought two sets of tires recently and with all my other purchases, my exec membership will be paid for and then some. With exec membership, I also have free towing for my car.
I love that place, and have been shopping there for more than 10 years