Why Hire a Coach/Personal Trainer?

I’ll admit that when I started my education to be certified as a coach/PT, I didn’t have any experience as a one-to-one PT client. And I could not imagine paying for one if I had the money. “It’s a lot of money to hire a PT!” - I thought. “Why would I ever do that?” - I asked. Well, it is a lot of money - relatively speaking. Why would you do it? Why would an ordinary person spend their dosh on paying for a coach?