The dating world is full of monkeys. Baristas, out of work actors, "office managers," bartenders, literal starving artists, set designers who make $15k/year for working 60 hours a week all year, .... (We're talking "this is what they do" people, not goodwill hunting "unlimited potential" people who turn into rocket scientists at the drop of at hat.)
Imagine you're a YC person: Altman or Dallas or Quinto or whoever they have these days. At what point in a relationship does it get annoying not being able to share the upper parts of what you are and what you do? Sure, you can always commiserate about the weather and the latest TV shows or what your 188th level Orc Paladin did in WoW this week, but does that give meaning to "high achievers?"
That's the lanterns in the dark versus the rabble of reality tv watchers.
(Cutting off some replies here: yes, there's a continuous gradient between "only-a-barista" and "only-a-serial-billionare," but there are levels people seems to get chunked into fairly easily after talking with them for 5 seconds to 5 minutes. yes, some of these positions are due to life circumstances and coincidences along the way, but that's the life we end up with—we can't all go back in time to be born to the mother of Bill Gates.)