People who go to med school spend an equivalent of time and effort to become physicians/surgeons and many of them openly admit to doing it for the money/prestige/job security. I am definitely interested in machine learning and would be happy to do research, but why is it wrong to say I also want to it for those reasons?

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Asking as someone considering a PhD in CS at top 20-40 after my B.S. in math given that it is funded…