Two car dealerships, Dealership A and Dealership B, both make an average of $1,000 profit for every car they sell. Using deceptive sales and pricing, Dealership A sells 100 cars in May. However, none of those 100 customers ever buy from Dealership A again. Dealership B is honest with its customers but sells only 70 cars in May. However, 30 of those customers buy an average of three more cars from Dealership B throughout their lifetime. What is the difference in the monthly and long-term profit between Dealership A and Dealership B from those customers?