He probably charges the $20 removal fee, then takes it to a mate, who scraps it (hence his fee, it does cost him).
Then his mate scraps it & gives him a percentage back.

At loosing his $20 fee, hes now relying on the percentage to make a few bucks, same as you.

90% of people arn't going to think of scrapping it, just what its gonna cost them to get rid of it, even thinking about the problem gonna cost them more than $20.