I can see what you mean, we ( = professor an I speculating) thought that would be factor. OTOH, people go to the doctor only when they're sick, which is also a bad state, but being a doctor isn't considered a thankless job whereas IT is.
Just speculating here, but I think it has to do with how a lot of people seem to look down on IT, and tend to blame them for their problems. With doctors, the people tend to look up to them, and don't blame them for their illnesses[0].
> when they called
I'm pretty sure this makes an enormous difference as well, btw, compared to face-to-face communication.
So we got three examples of service work, where the interaction with the customer completely shapes the experience for everyone involved.
[0] ignoring malpractice cases and such, but that's after treatment, not before.