It's simple capitalism. If you're one of the relatively small number of actors whose name and reputation is such that thousands of people of willing to shell out $100 to see you, then shouldn't you be compensated for the extra tickets you sell for the producers? There are folks whose name on a marquee guarantees good box office even when the product they are in is terrible.
Adam Sandler makes stupid movies that are panned across the board by every critic in the business -- so bad that if an unknown actor were in the film, very few people nationwide would bother showing up to see it at all, but with his name above the title, that bad film will gross $30 - 40 million in its opening weekend. Since the ONLY reason anybody showed up to see that film was him, why shouldn't Sandler make $25+ million from the producers getting rich off of him?
Same with Hugh Jackman. How long do you think "Boy From Oz" would have run with an unknown, but very talented actor in the lead? A week? One night? Considering the mostly scathing reviews it received, it wouldn't have survived a minute without Hugh Jackman's star power. Jackman is the only reason the producers of the show are even close to recouping their $8 million investment -- so do you pay him the $1300 minimum and let the producers pocket the rest or does he deserve whatever it is they're paying him (and he probably deserves more).
Same with certain sports figures and other celebrities. Certain ones are so popular that tv ratings and advertising rates soar every time they appear on the screen. Michael Jordan being in the finals typically meant NBA ratings would be double their usual level -- Forbes magazine once estimated that Michael Jordan generated in excess of $1 billion per year for the companies whose products he endorsed .... one can hardly begrudge someone like that a few million dollars in endorsement fees considering how much more money those companies were making off of his name.
In a better world, perhaps good teachers would make more than athletes and nurses would make more than movie stars, but under the economic system we have, those lucky few who have "names' that inspire thousands, even millions, to pay good money for products associated with them, deserve to be paid a decent portion of the revenue they are able to generate.
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney