In the same vein, but slightly different.
Take a look at the treatments you offer, and work out which ones make you little or no profit. Then ditch them.
I no longer offer spray tanning because I simply won't work for peanuts. Every man and his dog offers them for a tenner, and I won't. I use the time to do more productive things like writing marketing emails for the more profitable treatments, and these DO make my boat go faster.
Think about it. By the time I've got someone in, consultation, undressed, sprayed, paid and rebooked, we're looking at what, 25, 30 minutes. For a tenner?! Not on your life!
I can do a facial in an hour for which I charge £60, and I always, always, retail. So, In that one hour I can genuinely take anything up to £400.
That £10 for a half hour looks rubbish next to that, doesn't it!