You do realize though that the people with Bentelys or a new Porsche likely actually *care* a lot less about their car than the other guy, right? I see it all the time around here- people who can afford a $300k car can also afford to treat it like a beater. There are regularly Bentleys or Rolls-Royces parked between cars getting new door dents/scratches on them (that the owner will likely never even notice) while my '76 Volvo is parked half an acre away at the end of the lot. If something goes wrong, they'll just have it fixed. If it gets damaged, they'll replace it. I can't afford (the money or the time) to do that and if I just let everything go, my '76 would not have lasted nearly as long as it has.
I have had someone tell me that "why do you care, it is only a ***." There is no quicker way to lose my respect. And I DO start out with respect every time. I would never presume to tell someone how to do his job (or hover right over someone in his way). That only happens AFTER he proves he doesn't know how to do it himself!
No time? No specialized tools? No place to keep a car on jackstands unattended? No heated space to work when it is 0F outside? There are all kinds of reasons.
I never thought of that but you are more right than wrong. I'm lucky as there is a Hardees next to the tire place I use so I can go get something to eat while my tires are being done. I watch through the window, even for a simple inspection, as I've seen too many people ripped off. One bad tech can hurt the reputation of many other techs unfortunately. People get burned once and feel like everyone in the field is out to cheat them or do bad work. 
