My own question is: Do you pay for the shampooer, in a fancy salon, if it is a separate person?
I go to a swanky Fifth Avenue salon, and the shampooer washes my hair & brings me coffee while I'm waiting for my stylist. I'm never sure if I'm supposed to tip her, or if the Stylist gives her a percentage out of her own tips.

I usually tip my stylist 20%. In turn, she bends over backwards to fit me in for last minute appointments and free bangs trimmings in between.