Actors have a kind of legally-enforced monopoly. They're not employees you hire, they're products you buy.

If you want to make a movie staring Nicole Kidman, you have to pay whatever Nicole Kidman wants you to pay. You're legally forbidden from hiring an "off-brand" person and making her look indistinguishable from Kidman.

If you want to hire a Scala programmer, there's plenty of easily-replaceable people willing and able to do that job. No single person dictates how much money Scala programmers make.

Famous actors are basically a category that they're the only member of, and so they can set their prices. You can switch to a different category )(just as you can switch from Scala to Typescript) if one becomes too expensive, but that too carries some expense.

Franchises have a similar problem. If all your friends are watching Game of Thrones, you too want to watch Game of Thrones, even if there are other shows which are just as good. This means the Makers of GoT can dictate GoT prices, because the government gives them a legal monopoly on GoT distribution.