IF the average cost is $1700 to paint an interior, then that means the cost of paint is approx. $200 (12% of the job). Or better said 5 gallons of paint (if the average cost is $40 retail). The average room takes 1.5 gallons which will cover 3 average rooms. Doesn't sound to average to anyone with knowledge of this industry or a average house. You are misleading consumers and should do a better job in your research. No wonder so pay people think prices to get work done by professionals is high. Its not high, its actually average which is more like $3700.