Based on experience with stores in my area currently? Groceries. Incorrect and forgotten items, incorrect prices, wilted produce, nearly thawed frozen foods, swapping significantly more expensive alternatives despite my checking the "do not substitute" option.
Some people don't have a choice, or find it convenient for reasons that aren't relevant to you. You personally not needing something, doesn't mean no one else does.
Honestly, imagine being that self cantered..
It has been a god send for me. My wife is completely disabled and I’m her caregiver. Having someone else do my groceries and we still get good fresh food has been amazing. It is so much better than six or seven years ago.