I think the fact capitalism allows skills which have no real value to society to achieve that level of fortune is a significant point against it.
That's always been an interesting thing to talk about, people have said the same thing about authors. The reason why these types of millionaires exist is because they provide a small amount of value to a LOT of people at relatively low cost. Someone like a heart surgeon though, provides a lot of value to only a few people. The heart surgeon clearly does a more important job, and though they are well compensated, it is not even close to the amount of money a celebrity receives. I don't think anyone would be sad if celebrities received a smaller paycheck and the price of their products fell, but our market isn't equipped to make that happen
Economists have a term for this actually. They counter-intuitively call these types of individuals "land", and the economics of "land" differ greatly from traditional economics leading to the market perversions you see. What makes something "land" is the fact that it is unique. There is only one of it.
Take J.K Rowling for example. There may be multiple editions of harry potter books, multiple translations, multiple other stories about magical kids in wizard school, but at the end of the day there is only a single
Harry Potter story, making it "land". Once a bookseller acquires the publishing rights, they have a monopoly on it and can dictate the price. That price ends up being the highest price consumers are willing to pay for.
In a healthy market, there'd be a downwards pressure on the price from other producers ready to sell the
exact same thing, but cheaper, and eventually competition drives the market to an equilibrium where producers only make slightly more than the printing costs, but since we are talking about "land" here, that doesn't happen. The only way other companies can compete with Harry Potter is in quality, by trying to usurp Harry Potter with their own unique superior IP. This is already pretty messy since quality is subjective, but even if another author were to utterly "beat" Harry Potter and steal its fans, they would just be in the same position of power J.K Rowling was in and charge the highest price the audience is willing to pay for, since no one is allowed to make a cheaper version.
I don't think anyone will be impressed by another lecture on why IP laws are pretty fucked, but the concept of "land" goes far beyond that. It covers athletes, it covers singers, it covers paintings by long dead artists, it even covers honest-to-god real estate. The free market was only designed around goods that were easily manufactured, whose production could be scaled up as demand grew. This is as "round peg to square hole" as they come and as a result, I believe that it is our duty to create a new system to cover this class of goods.