I know I read this somewhere recently but it's the same idea, the reason MOST small business fail is because of a failure to be a business man instead of a detailer, or mechanic, plumber etc.
I've worked in service sales for the past 13 years and I can tell you, it's the guys with the best marketing, and then service that succeed. I think anybody trying to make a living detailing needs to have 80% geared toward low end wash-wax, clean interiors and 20% or less the FULL monty paint correction. You have to appeal to the masses and maybe a couple will hang around long enough to catch the meaning of what a real detail actually is and decide they want to go that route. I lost a customer, long time friend actually when she decided that she would rather spend 25 bucks at the local swirl o'thon than have me detail her new Honda, makes sense to me - save a few dollars and get your softass paint swirled - it's supposed to look that right? That's what I compete with.