Then do not come to Samui.
Local salon in the shopping mall charges 800 baht for a haircut - includes washing and blow dry.
I said that I only wanted the haircut - not the rest.
Still 800 baht she said.
As you say, others charge from 100 to 500 baht.
You get what you pay for.
Most do not know how to 'cut' men's hair unless it is with the clippers.
They can be useless with the scissors.
A friend uses the 100 baht haircut and it is obvious.
Even he said that the cut is rubbish but now that he is retired, he does not care.