Need more money? (not some BS scam)

Whose to say when you buy something, somebody else down the road isn't selling it cheaper? How is what he's proposing wrong? Isn't that the American way? When you go to a tire store, you pay sometimes three times what the tire costs the store. That's a 300% markup. I know. I worked for one like that. Same as any other retail business. They buy products at one price, sell them at a higher price. So, where's the harm? The example he gave was a 21 dollar profit. I got no problem with that at all.