re: Tipping for a men’s haircut

I have worn an old fashioned flat top for years and my local barber charges $10.00. I always pay him $20.00 for the cut because 1. he is good at it, 2. it is hard to find a barber these days that can cut a real flat top, 3. He fits me in whenever I call and 4. I feel like $20.00 is more than fair for the cut, neck shave, eyebrow trim, and good conversation.