There are 10x more pocket watches than owners interested. Theyre incredible machines... but their greatest use is practice materials for aspiring watch repair technicians.
They're expensive to repair because few people have the skills and tools. The demand is so low. (I have two)
I actually discovered pretty early on that my interest was more in clocks than watches, but the early explorations in the watch realm were almost entirely applicable to clock repair as well. I have since repaired at least a hundred clocks and pocket watches. Next month I'm going down to the NAWCC school of horology in Columbia, PA to take my third workshop there, this one on the repair of wooden works clocks. The school was closed for a number of years, but has fired back up in the past few and I know they're actively working on getting more watch repair workshops going. Last time I was there they were just putting together a killer watch lab with some very expensive benches and equipment.