Hair Cuts at Great Clips (or where ever) do you tip?

I have been using Lynn now for 8 years and the shop has moved about 5 miles farther away (now 20 miles).
I can get an appointment with a simple phone call at a time convienent to me and the most I have had to wait is about long enuff to sit down to read a car mag and she calls me.
I have (upon occasion) had to break an appointment and she appreciates the phone call.
Once I got hung in a huge traffic jam at an accident and I called her (I was 5 minutes away) and she was just finishing up with the 2nd guy behind my appointment as I walked in the door 1/2 hour late.
She always asks how I have been, what did you ride today, what car shows have you been to, how are your son's, etc.
I always tip her and have been known to give her a small gift wrapped box at Christmas and also close to her birthday.
It always contains her favorite gift.... the smell of money.

A little kindness goes a long way !