A young bull and an old bull are at the top of a hill.

Think of a restaurant as an example. I could hypothetically charge $100 for a burger that costs me $2, but I might only have one customer who buys it, so I make $98. But if I sell the same burgers for $5, and 100 people buy one, I just made a net profit of $300. Basically, don't fuck one cow fast and hard, fuck every one very gently.