This combined with a possible proliferation of food carts due to lowering barriers... if I was starting my food vending business I'm definitely trekking down to the store where I can get some ingredients at a 30% discount.
I genuinely don't know how to explain to a presumed adult why costco makes more sense as a supplier than a bodega. find whoever it is who makes sure you don't give yourself sepsis by licking your hands after you wipe your ass and ask them
I know it's upsetting to realize you're wrong but insulting me doesn't change the fact that if someone can buy something at a lower price at one location they'll do that.
Your life will be way easier and more successful if you can live with that feeling of wrongness.