The reason is how cutthroat it is now.

Los Angeles Times reports.

Why I won’t reenlist as a Yale alumni interviewer

Last year, I conducted alumni interviews for Yale applicants. It’s an easy gig. You take a smart, ambitious 17-year-old out for hot chocolate, ask him about his life and then report back to the university, “Yup, this is another great kid.”

I recently got an email asking me to reenlist. Was I ready for another admissions season? I checked “No,” mostly because “Never again” wasn’t an option. I hold no grudge. I have no ax to grind. It’s just that the whole process is so spectacularly insane that participating in it — even in such a peripheral role — feels like watching spiders crawl out of my tear ducts.

In the last couple of decades, Yale’s applicant pool has gone from hypercompetitive to a Darwinian dystopia so cutthroat you’d feel guilty even simulating it on a computer, just in case the simulations had emotions.