According to the market, actors clearly are not worth the wages they demand. Somebody like Scarlet Johansson or Matt Damon are not worth 20 million or 40 million or whatever, if their product is only making 20 million in profits.
https://www.the-numbers.com/person/550401-Matt-Damon#tab=summary
Matt Damon's world wide box office total as a lead actor is: 5,681,750,746
ADD TO THIS
Matt Damon's total box office as a supporting actor is:
793,093,553
ADD TO THIS
Matt Damon's World Wide Box office as a member of an ensemble cast is 1,349,423,600.
So for the 20 mill that you think is not worth it you are getting an actor who has made 7,824,267,899
** EIGHT BILLION DOLLARS!!**