Here is an example. I remember a TV drama that had 4 young stars, all with equal billing. Each received about $50000 per episode. But one actor demanded more because he previously had a small part in a movie. So his agent negotiated a salary of $50500 per episode. Some negotiate a larger trailer than others. They use the trailer to relax while waiting for the crew to set up the next scene.
Some have huge egos.
The TV comedy "Two and a half men" had very high ratings for 3 years in a row. Jon Cryor got $700000 per episode. His co-star, Charlie Sheen got $2 million per episode. There are 24 episodes in a season. That is a lot of cash.
Charlie is one of the "baddest" of the bad boys in Hollywood. He had hired many prostitutes and made no secret about it. Many would not charge him because they enjoyed the bragging rights of having slept with a big star. He dated a porn star for a year. After a while, the drugs that he was taking, began to control him, and he checked himself into rehab. Warner Bros. fired him.
In the finale episode a helicopter carrying a grand piano, dropped it on his head.