It would depend on how often OP orders food in. Also, they don’t run 24/7. Once stuff reaches the set temperature the motor stops. Another advantage is bulk buying. If butter is on sale you can buy a lot and freeze it. Same thing for staples like chicken. The unit works less when you fill it up because the cold food stays cold in the insulated box.
My usual pattern is to cook a 5 litre pot of soup or stew and freeze in in pint size size containers. Or you can make spaghetti sauce and freeze it in smaller containers. Tight now I’ve got lentil soup and chili sitting in my freezer. Takes about 7 minutes to cook in the microwave.
Also, and this is just because I live in a neighborhood with an abundance of Italian food stores, I get a lot of precooked or ready to cook meals at the store and freeze them.