[sp332]

Sure, that's what's neat about a market. The customers wouldn't pay this price if they thought it was unfair. It's not like he has a monopoly, or there's any other pressure for the customers to buy his product. If the customers are getting more than $20 of value, then charging $20 is a fair price.

Also, over the long term, it could allow him to cash out or retire or whatever sooner, so the total amount of money he takes from other people over his lifetime might not go up as much as you'd think.