I also have cut my own hair for as long as I can remember. I don’t know how much it would cost if someone else did it.
The only downside is when people ask where I got it cut, I say I cut it myself. They then need to inspect the cut for some reason. If someone else did it, no need to inspect. If they learn I did it, then some type of critique is necessary.
I used an old fashioned barber in the mid sixties in Handsworth in Brum, who when he had finished used to wave a lit tapir all round your head, when i complained he said singing the ends of your hair inhibits growth