I don't think your view is anywhere near as common as you think it is, but maybe in your immediate peer group there's some self-selecting cause for believing so.
I cannot do sales, I do not want to do sales, but if I want a job someone needs to do sales. To me sales looks like an awful job, but some people really get a kick out of it and I'm glad they do because otherwise I would earn a lot less than I do.
We love to think that "if we build it they will come" but the reality is very different, and most of us work for companies that would struggle to grow without some form of sales or marketing operation, no matter how good the product might be.
You meet new people. They tell you about their problems. You explain to them how your product can alleviate them. You work on finding a common position regarding what you could bring at which price. When it works, you get a big cheque. It’s pretty fun really.
Once that connection has been made I can definitely see the attraction.
As for what I think about managers: unsure, I have been a manager, worked under many managers (most of them bad) but I am still not sure if mangers should exist or be replaced with another role.
The point of my question is to make people stop and think about the chesterton's fence of why is that position there. For example your janitor example. Extremely well defined position. Most people do not want it (including yourself).
The reason most engineers don't have secretaries is because we usually prefer doing the same thing with automation and scripts.
Edit: To clarify lead engineer, they have authority over technical decisions, not people management.
I was terrible at it. Forced to actually contact customers I had no clue what to do. I had no idea how to price things. I communicated terribly and drove away initial customers.
I learned a healthy respect of other positions in a company, because when I tried them I had to accept they were actually hard.
Well product or sales probably don't like stuffing the product with ads, they only put it in there because you like collecting a paycheck every month.