I can’t speak to your numbers, but using the same salary comparison searches I used for the Pharmacy Tech position it looks like 3D Animator pay is somewhere between $50-105k national average with LA being $98-150k and NYC being $45-110k. Maybe game industry specific is the cause for your lower numbers?
I think that makes a weird sort of sense. I mean, if you’re gonna pay 1 person 3x what you pay the others you kinda expect them to shoulder more of the burden. Same goes for Doctors in general and Air Traffic Controllers, the barrier to entry is exceptionally high, the pay is high to match, but the expectations are even higher
I can’t speak to the union bit, but I would say most aren’t in a Union in the US since most of the US doesn’t have Unions. If you’re in an area that has them then maybe they get a better deal.