You can win as long as you chose your battles. You can win more arguments then you might think as a writer, even though you legally have no recourse, and your script can get muddied and altered in any way possible. You can use reason, logic, and passion to argue persuasively for a case in your favor. So what I've learned is to just basically not buckle - not be belligerent, not be angry, not throw fits, but just not buckle.
Shane BlackIt really started after The Long Kiss Goodnight sold for just a sinful amount of money. People were angry that I took the money. People offer you $4 million for a script - what are you going to say? "No, I'd rather sell it for $100,000"? But it engendered so much anger, I lost friends over it. And no one talked about the creative content of anything I did any more. They all just assumed I was this guy with a formula, a hack formula.
Shane BlackI think the most important thing is to, without belligerence, stand up for what want. Argue compellingly if someone tries to change your script.
Shane BlackOnce I started selling scripts for a great deal of money - action scripts, no less, which people tend to pooh-pooh anyway - then I started to get some backlash. Which I didn't mind.
Shane Black