I too purchase food from the food fairies every week.

The store magically gets filled with food definitely not from a farm, definitely not sent to a place to process the food into something that requires very little labor to cook. (husking, cleaning, prepping, packaging)

Then delivered to the grocery stores, and stocked on shelves. All from the kindness of their hearts they do this. You just give them money because that's how the magic works. Without money, there is no magic. Ex: industrial light and magic. They turn money into special effects.

This is the kind of logic that led to people believing milk comes from the dairy, and that brown cows make chocolate milk.