Eric Scheie has the same attitude toward haircuts as I do:

I’m definitely into minimizing my disutility, especially if it saves time, plus I’m lazy about these things. I end up having my hair cut too short with relatively long intervals between haircuts. Of course, there’s a very noticeable contrast between what I look like right after a haircut and what I look like after six weeks without one, but it’s a gradual process interrupted only by sudden contrasts in my appearance. I realize politicians need to look the same all the time, but I don’t.

It’s not just the cost of the haircut. It’s the irritation of it, in terms of time out of my life, and having to interact with the haircutters.