I don’t know about you but there are some people I am close to working on high end vfx projects, including marvel related work. Some of them are leads and not low level vfx artist. On average they make between 4000-6000 a month. I know some that even make less than that. So yeah, they are not paid as much as you think. The only time you see more money come in is when they have to work massive over time shifts 10+ hours a day, and on weekends with an hourly wage.
If you are in California (such as Los Angeles), you also get tax penalties for going over a certain rate, not to mention the cost of living here is so high it might as well be extortion this point.
Unless they are a department head, I can’t imagine anyone in that position making double or triple that, much less 4 times that. They are more likely to hover around the $4000 range give or take.