Turn the question around.
You are in an unfamiliar town and pull into a self serve to wash your car, because it is dirty and you want it clean. Are you ... really ... going to get back in your car and drive away with a dirty car based on price for services?
I want to focus on the repeat clientele who come in to wash CARS and are willing to spend $3 - $5 to wash plus maybe buy some
vending products or vacuum. I'm willing to let the low end truck bed washers and ... whoever else ... go to the cheaper competitor.
I figure the good client cares more about good pressure, quality soaps, and high reliability of the equipment rather than whether it costs them $1 more. On the other hand, the minimum-time bed washer probably looks at just the opposite.
Who do you want to focus your business success on?