I'm single, with 2 small children. I do a weekly meal plan and shop once a week.
If 3 extra adults dropped in for lunch, I'd either be able to feed them but have to go shopping again, or not have enough food in to feed them at all.
Its not like I can't afford to, I just buy the food that we, as a family, will eat. I have a small freezer. I could probably manage dinner better.
Am I that unusual?