Some newbie Notaries Public are newbie business owners and have little to no business education.
Unlike a business person, they may say/think they made $30 an hour with no costs.
Why, you may be asking, because they have gasoline in the car so they didn't 'have' to buy gas to get to the appointment.
They may have paper, toner, printer, computer, etc. so they didn't 'have' to buy any of these items to get the job done.
They may have insurance on their car so they didn't 'have' to pay for insurance (It's likely they haven't told the insurance company they are using the car for business).
And there is more...