The question to the why is, of course, to save money and stretch your budget to the limit.
The Captain and I are very blessed to have the privilege of having access to our local air force base commissary. We always shop the seasonal case lot sales, take advantage of monthly sales and plan for our purchases with their listings of sales on the internet.
Last year we bought a case of Kraft Mayonnaise that cost us 75 cents per bottle. Big savings and we didn't have to worry about buying mayo for over a year.
My favorite case lot sale included Pepsi products that equated to a 2 liter bottle of soda for 35 cents each. We stocked up with massive quantity buys since we go through a fortune in Pepsi products. Yes, we saved a ton of money on that one sale.
Although I have not been a member of Sam's Club type of store, I am sure similar savings can be found if you take the time to find those bargains. Make sure those big purchases are for items you often use and won't just sit there in the pantry.
Click here for a well written, informative article titled "Why to Have a Well-Stocked Pantry."