I’m pretty sure that, in a normal situation, I would not employ a private investigator, but I would not say never ever.
I haven’t had any personal experience with private investigators, though I know someone who works as it.
I don’t think I would like this kind of job, too many hours watching and waiting for something to happen, and maybe nothing happening at the end.
I would say that my jobs cannot be considered especially interesting or strange, I work for public administration managing IT systems