I guess it's bit of celebrity money or sth, actors also get ridiculous amount of money compared to people who are editing, screenwriting and so on. And if I remember right there was news couple years ago that Simpsons almost stopped cause voice actors were asking ridiculous amounts of money for their voice acting.
Yes checked it, they get like 300 000$ dollars for episode and got earlier more and show was almost cancelled, because of that cause company didn't want to pay 400 000$ for episode anymore. I mean that's ridiculous amount of money and not really normal salary of person, that's celebrity salary. And if gaming voice actors are demanding same no wonder that gaming companies are feeling the pressure.
Those salaries are for the stars, though. Those aren't the people the union protects.
The union establishes a minimum wage and working conditions for its members. Individuals can negotiate something better, but the union establishes a floor.
This is perhaps easiest to see in American sports. The MLBPA negotiates on behalf of the players to establish a minimum salary and basic rules about conduct and schedule and whatnot. But individual players can negotiate better salaries or other benefits if they have leverage.
But the MLBPA also shows us how the initial negotiating position isn't always real. Traditionally, the MLBPA opens each bargaining session with the demand that the season be shortened by 8 games. They never get it, but it's a bargaining position rather than an actual objective.
Labour negotiations are typically quite adversarial.