A good one can easily make 100k a year, a shop a few buildings down from where I work has a couple. One's single and drives a brand new fully loaded Porsche Cayenne SUV, she's never not booked weeks in advance. Not sure how many clients she can do a day, but I know some pay around $250 for the uber fancy with rhinestones and air brushing sets.
One thing I've learned working by a beauty salon and just knowing high maintenance females. There's no such thing as a recession for good salons, females will always find a way to get the the money to stay looking good, There's a few hair stylists there who have crazy nice cars. There's one that's single who has this limited edition Infinity G37, I've never seen this exact model before, she said it was custom and had to be special ordered. A few of the other females there have nice BMW's.
I've never asked any how much they make, but if you're single and driving a fully loaded Porsche you're making a good amount of $$$. Also all these chicks dress nice and have MK bags and such.
This is still guessing at best.
You can make $50K and still drive Porsches, BMWs....
I can buy any of those cars you mentioned and I don't make $100K/yr.