I'm single and it pays for itself ($50 a year) even living a 120 mile trip away!
I eat meat, so you can get it in BULK, well, everything is bulk...
I LOVE getting 6 massive (not overripe nor underripe!) avocados for $3. Where I live, avocados of half that size sell for $2 each -- on sale!
I LOVE getting organic spring mix salad in a 2 gallon tub for $3. Where I live, 5 oz cost $3.50.
I LOVE getting a jar of digestive probiotics that lasts 3 months for $11. Usually a 1 month supply costs $18 at discount stores.
I could go on and on.
I don't work for them (couldn't living so far!) but I think it's a fallacy to believe they're expensive. I mean, maybe you can walk in there and find something expensive but everything I pick up is a FRACTION of what it costs elsewhere.
In case you're wondering about a single person sucking down all that food, I can easily eat 2 gallon of salad in a week. I eat it no less than 3C at a time (maybe 4) with protein on top for a meal. As to the avocados, okay, that's pressing it! :) I do have to make it a point to eat 1/2 of one a day. It's superior fat which helps my HDL, so I'm good with that. :)
Fruit, veg and meats are frozen.
Oh! I also get raw nuts there, so much cheaper than anyplace else (for me). And coffee. And...Seriously, I probably save more than the annual membership per trip -- then again, living so far away, I go there only once a month!