Well my comment was a little tongue in cheek, but $135k is nothing to take lightly.
As a serious point though, the same can be said about electricians and any other trade. Yes I can do the job myself (to a point), but law requires that a licensed electrician does all electrical work on my house. So I have to pay for someone's expertise and time.
Same can be said for vets, you are paying them for a professional service. In this case it may have been a simple operation, but in other cases it may not be as straight forward and that's when a vet's experience and education may come in. At the end of the day there are professions where you pay for a professional service. Lawyers, doctors, vets etc. My lawyer charged $220 for half an hour just to listen and go over basic stuff. They charge god knows how much just to write a basic letter, or to take a phone call!
So on first glance it may seem unfair that he gets to charge that much when you can do the same thing, but that's the way it is with higher educations and professional services. Personally I would trust people like yourself more than a vet when it comes to fish, simply because you deal with it every day. A vet may only see a fish once a year unless he's a specialist
Edit: I didn't watch the video so I don't know the vet's level of skill.