See, the thing is, you can't just hire anyone to do Photoshop work on a TV show. It takes years to become an expert on Photoshop (you get a certificate from Adobe itself, this isn't a joke), and these people charge a lot of money (in comparison to, say, self-trained workers) to design or make edits related to Photoshop (or whatever other program they use). And yes, they do charge by the hour, unless there's some sort of mutual agreement. I took courses on Photoshop myself, so I know about these things.
I don't know what kind of deals 4KiRAB has done, or if they use certificated users or just people who "know how to use the program", but to say edits don't cost much money is the understatement of the century.
