This man is a “Grinder”. The promise of more work for a freebee now has been made a billion times and kept probably never. Tell him that if he pays you double your going rate for this :30 second piece that you will do the rest of his season at half price. If he complains or walks away from negotiations, he never intended to pay you a cent.
Hope I just saved you doing a ton of work and get jacked for the pay.