Without knowing your market I would say those prices seem a little low. You may be surprised that if you bumped up your prices that the quality of vehicles will improve. I noticed when I opened my second store in a more middle class town(Saco) compared to my flagship location(Kennebunkport), the customers were looking for more because they did keep their cars longer. Customers in Saco are twice as likely to ask what the service includes and the benefits to each step; whereas, the K'Port customers ask how much and when can I get in. My high end customers know they will get a new car in a couple of years; therefore, not necessarily looking for my premium services. If you don't differentiate yourself from your competition in pricing, what indicator is there for the discriminating customer to know to come to you? Meaning, most people associate price with quality and if you have the average price... you will have the average customer.
My exterior pricing begins at $115.50 and goes up from there. That does not include swirl or scratch removal! I like nothing more than when a customer asks me how I charge more than my 'competitors', gives me a chance to distinguish myself from the other guys who happen to call themselves detailers.
Doug