Answer:
Most crop duster pilots are paid by commission. That usually is 20-25% of the gross the airplane charges for the application. This translates to $.75 to $2.00 per acre for the pilot, depending on the charge per acre to the grower.
So, depending on a few factors like size (capacity) of the plane, size of the field being treated, how many gallons per acre of spray is being dispensed, ect., it ends up to be between $100 to $400 per hour pilots pay.
Total income for the year is based on how many acres are treated (remember, pay is based on commission, but usually range from $30,000 to $100,000+ per year.