Interesting about Vicki. I am a 7w6. My youngest sister is a 7w8, and she very much liked YMOYL, but one of the main reasons I am having difficulty promoting ERE with her is that her friendship circle includes a lot of people who inherited a lot of wealth, so she keeps arguing Picketty back at me.
I think you may be right about personality type trumping as one approaches (or approaches and recedes in wild oscillation as a 7) self-actualization. However, I "see" the FIRE space as being occupied more by *NTJ than INT*. Extroverted thinking or clearly displayed competence is more towards being a consistent "earner." INTP is more like somebody who would be an absent-minded, broke-azz yet frugal chess champion living alone in a garret*. Though I suppose in the current tech-driven economy, an INTP might be better renumerated than in other eras.
*Wow! I just realized that "I" actually currently do live alone in an actual garret. Clearly hanging out on this forum has had the effect of moving my functioning more from e to I, rather than P to J, which might have improved my chances of actually making some serious $$$

