Race and Hair care

Why is it that there's such a huge difference in the cost of hair care depending upon your race? I work at a high-end retailer and this subject came up a few weeks ago in one of our "water cooler" discussion (in our case we were surrounded by $150 bottles of eau de parfum). A white gentleman I work with said he stopped dying his hair at salons and decided to just go gray because the cost was so expensive. He said he normally pays between $75 and $125 for hair coloring and a cut. I thought this was absurd considering he's a guy without much hair. Then another coworker who happens to be white and female said she pays up to $200 sometimes just for highlights. To me these numbers were piercing my ears especially since I've never paid more than $50 for hair coloring. So why is there such a big difference in cost? Then I got to thinking maybe its the type of salons. Yet still it doesn't make sense to me. My roommate for instance pays the exact same price as I do for a cut and style. She goes to the Tony and Guy salon and I go to Skillz Salon. Both salons are a part of a franchise and pretty trendy-based. About a year ago she stopped getting her hair colored at Tony and Guy and started having me do it. She said that when she gets her hair colored she always ends up spending about $100. So again where is this capitalization coming from? Speaking with several friends outside of my race (I'm black) it appears that they are paying a much higher cost for hair care across the board. The salon I go to is an all black salon and most of my friends go to white-owned salons. It just seems like where all getting the same thing done yet different cost.