Because it seems to be the done thing today? 
For fun: Tell me your most unreasonable hairdressing stories. (Either with YABU or the Hairdresser.)
I told my hairdresser I didn't want a fringe anymore and rather than taper it out she just lopped it all off and I had half a centimetre of hair sticking straight up all across the front of my head. It grew vertically for a good 6 months....