salespeople called me to do a demo at a hedge fund (as a product
“expert”).

When that happens, my little rebellion is to insert little geeky tidbits
into sales presentation that salespeople usually don’t get.

And it works in ways they would not fathom. There is always someone at the client who would recognize a picture of sunset on Pluto on my screen background. Or that I used Milton Friedman and Friedrich Hayek instead of John Smith and Jane Doe for user samples.

In reality, people who work at hedge funds are mostly (math, compsci, astronomy, economics, history -major) geeks who were unfortunate enough to
end up in this industry and are by now used to suppressing their souls until they retire, while getting used to the comfort that money they sold their souls for brings, making it impossible for them to give it up.
Awakening that geek in them makes them instantly like you.