Do you enjoy eating just rice wrapped in a tortilla or something? Burritos are a harsh illustration of the economy of scale. Doing a quick tally with sale prices, and I'd think buying all the ingredients to make one single burrito would be upwards of $20-25, at least. Never mind the time to cook each ingredient that needs to be cooked. And most of these supplies and prep are going to last what, ~4 days before they spoil?

That sounds really cheap, if you don't consider that you need to do all the shopping, you need to prepare all the food, and deal with probably a bunch of food waste.