Why do these A-list stars get "face off"?

Why do these A-list stars get "face off"?

Do not know because of star disease or do not want to participate in the film that these stars have made a very unreasonable demands that the studio sleepless.

Emma Watson and Miles Teller and La La Land

The main roles in La La Land were intended for Emma and Miles, but it was rumored that Miles would not accept a $ 4 million paycheck and was determined not to pay if he did not have more money, and Emma demanded a rehearsal in England. New countries. As a result, Emma Stone and Ryan Gosling were given two lead roles.
However, both actors have denied this information.

Bruce Willis and The Expendables 3

Joining the first and second episodes, Bruce claimed $ 4 million for the third installment while the studio offered $ 3 million for four days of filming. So Sylvester Stallone was very angry, to Twitter "kick" his colleagues and immediately replace Bruce with Harrison Ford, Bruce very surprised.

Edward Norton and The Incredible Hulk

Edward is known for his "hands-off" creative work on the film he's been working on, and he wrote the lyrics for the first Hulk film. However, most of these lines were cut during post-production, causing Edward to be extremely angry. Eventually Marvel replaced him with Mark Ruffalo on the grounds that they needed a more cooperative Hulk.

Tobey Maguire and Spider-Man

Tobey once pretended to have a back injury and hired a doctor to declare he could not afford to film more than $ 4 million, resulting in the studio replacing Jake Gyllenhaal.
Then why do not we see Jake as Spider-Man? Tobey's wife advised him to "lower the price" to get a good role for this career, so Tobey turned out to replace the newly chosen guy to replace him.

Will Smith and Django Unchained

Will is extremely fond of the film and is keen to get involved, but he does not want to emphasize the revenge aspect that he wants to film in a more romantic way. He claimed that "unjustified oan ever before", only love is the "answer", so Quentin Tarantino decided that Jamie Foxx is the answer he needs and Will lost his role.

Tom Cruise and Edward Scissorhands

The first person Tim Burton aimed at Edward Scissorhands was Tom Cruise rather than Johnny Depp. But Tom was so excited about this role that he asked so many silly questions, such as how Edward survived after his creator died ?, how was he going to the toilet? The crew felt tired and decided to send Tom away soon.
As a result, Johnny and his then-girlfriend, Winona Ryder, were invited to film and create the movie superstar of that time.

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Ryan Gosling and The Lovely Bones

Compounded by Peter Jackson as his father's lost son, Ryan thinks his character will be a dilapidated, obese and depressed man. So he took ice cream to replace the water to gain weight. As soon as he saw him with his slender body on the set, Peter immediately said goodbye to Ryan.
Maybe apart from Ryan being dismissed for not being directed by the director, the rest seems to be a bit over-done, do you agree?