An MFA in film is worth it IF and only if you're going the academia route. The level of theory you get in a BFA program is far more in-depth than what you'd get at a trade school. Certain types of skills in the business (namely screenwriting) actually benefit from the school setting. Beyond that, the only thing a BFA has over a trade school is the networking. The actual film production skills can definitely be learned at a trade school, and chances are you'll actually get to touch film equipment in a trade school a lot quicker and more frequently than a 4-year student would.
I think you meant best boy grips as opposed to gaffers, if you're a gaffer on bigger productions you make bank and you're the lead man of that G&E department. Even best boy grips can make decent money depending on the region, in the Bay Area the going rate for best boy grips on commercials is $600-650/day. If you work 15 jobs a month that's $9,000 a month or roughly six figures before taxes right there.
Slow your roll playa, STEM ain't the only way to make six figures. It might be one of the more straightforward ways, but there's many roads to do that if that's your definition of success.
Now, for those whose only plan/vision to making six figures is going to school and getting a degree, breh is 100% right, skip the arts degree and do STEM. If you know how to network and how to invest in yourself whether you're in school or not, the playing field is a little wider, but you still need to be smart about where you spend your tuition money and how much.