Calestus stated this one very well.
Frozen,
You need to remember that there is a REASON why folks are willing to pay $300+ to have their cars detailed, and that is because they are most likely worth it.
Far too many detailers, or wanna-be's (not saying you are one) use the logic of, "Hey, lets do the same amount of work the high dollar detailers do for $200 less....man the people will be breaking the doors down!!"
This flawed logic though ends up back-firing more than actually working because 1) After a few cars they finally realize the amount of work involved and then begin to cut corners thus resulting in poor work and word of mouth then kills them and 2) People, rich people, for the most part live by the rule of "If it's to cheap it must suck!"
In other words they may look at your prices and think....."Hmm, this guy will give me a full detail for $200 less than the guy down the street. I wonder whats wrong with his work?"
A few years ago I raised my prices and while I lost a few clients I made up for them plus some because wealthy people feel that they get what they pay for.......but don't think that they will stick around for hack work either.
Good luck,
Anthony