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

my wife does hair and we count on the tips
her take home of what you pay for your cut is noting really its all about the tips

if your cut is 10$ she gets around 4$ so if u tip 5$ she made 9$ on your cut it may only be 15 mins your there but it maybe her only client in that hr so she made 9$ a hr WOW
luckily she works at a high end salon guys hair cut 25$ and up plus tip