Pure I know one thing i would be absolute highest in my area and only go after 2% of population and do it relentlessly and start parttime keep current job for 5 yrs and build a very very solid clientele That is based on Relationship/Skill not cost.I wouldnt even post prices because if they asked price probably not my kind of customer.I am just saying what i would do since YOU asked...Is this the wrong method to a solid business?
Well that sounds like a statement I told the guy that used to live next door. He travels the country working on transmission towers. Cell towers is what he warms up on, for breakfast! He typically works on towers over 1000 FEET TALL! I told him I might very well do that job, but I'd only have to do it ONCE!

Because for what it'd take to pay me, I'd be set for life!!!
WOULD is the key word here....I can detail no problem but man how does anyone make money at less than $75 a hour with insurance,taxes,overhead, Just trying to learn
Sounds like someone doesn't know how to budget their money. Insurance isn't that bad, taxes are taxes no matter what you make. (And if you make more, you pay more....)
You mentioned a $399 full detail. OK, so how long is that going to take, what 2½ hours? Me don't think so! Lets pretend it's something really small, say a Miata. OK, quick wash n dry, 2 guys going on it at once followed by a quick clay then another wash n dry. That's a SOLID hour with sweat dripping in all directions. Now grab 2 buffers and hit it with D300, no way even 2 guys are going to get that car done in under 90 minutes (likely 2 hours easy). And now we move to .......
ALARM IS GOING OFF...... TIME TO STOP.....
Already looking at 6 total hours into the job and not even STARTED glazing, sealing, waxing, LSP, windows, interior, wheels, wheel wells, tires. What was it, $399 / 6 , that's $66.50 and the car is half finished.
In other words, to get that magical $150 hourly you're going to have to wash in 10 minutes, clay in 10, compund in 30 etc.... Not gonna' happen, sorry.