This is an open secret in the business. Everyone knows this except illiterate noobs, and they are the only ones who get burned by it.
No sympathy.
Read any book on the film biz, and it will tell you about this practice.
Here's another secret: Avatar didn't cost $1 billion either.
Frowning takes 68 muscles.
Smiling takes 6.
Pulling this trigger takes 2.
I'm lazy.
"This is an open secret in the business."
LOL, I believe in the business that percentages of net profits are known as "monkey points".