I probably have $300-$400 bucks of "stuff" in my cupboard but I don't eat all of it every week. I do "too much" amazon subscribe and save and I like spices so maybe a "normal" cupboard only has $200 or so of stuff.
I think the idea is to promote creative thinking. So I'd fry up about a 1/10 of a bag of frozen broccoli and cook the mac n cheese and then add a can of tuna and mix all that stuff up into a tuna casserole and bake it, maybe broil it to brown the top which is WAY more than one meal for one single dude even accounting for the long term effects of food inflation (like mac n chee used to be a pound in the 90s, now its only like one cup in the 2010s). Maybe the day after tomorrow when the casserole is finally eaten up, a dash of oil in the wok with a bag of mixed veg and those meatballs and then some kind of homemade sauce, I bet you get two meals outta that at least.
Dude needs to buy more fruits and veg and more spicy stuff. I see vegetarian burritos and tacos and spring rolls in his future.