Just like any other arena, there exists a snowball effect.
When a precedent exists, you can justify something in your favor based on that precedent. Creative types are typically undervalued in the commercial process, so ANY victory that gives creative types (be they developers or voice actors) a better shake gives leverage for other creative types to get a fair share.
Now you knew that, but like I said in the tile...sides, there may be others with their blinders not so firmly buckled.