Well, they NEED to play it the same way (most of the time, anyway) because of the actors. I'm sure some do get bored, but not unlike actors it's part of their job to make sure it doesn't come thru in their actual performance.
As to other jobs, many do - but often because of the time they have on their hands. They give lessons, play in studios. You never know how long a gig will last, so most take jobs along the way to be financially responsible.
You don't become a pit instrumentalist because you want the limelight. I'm sure they are perfectly fine getting the recognition they do.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.