Am electrician, can confirm.
To be fair, I don't get called out to fix good work. If something's fucked, it's usually because some "handyman" who "totally knows what he's doing" was there before.
Between that, and the fact that most of the people involved in wiring up houses are just laborers under an electrician's supervision (ostensibly), yeah, I get plenty to complain about.
It also makes it easier, I feel, for customers to stomach the bill if I can adequately explain how much better off they are now that I've done my job.