I never did that in college because it seemed awfully manipulative to bother them unless I really needed it. It didn't even occur to me that that's what other people had been doing until I had almost graduated.

Being a student to me just really warps your perspective on the world because it confines you into such an arbitrary, stressful, gameable system that you either adapt to it and come out of it with a very flawed model of reality, reject it at your own peril, or suffer through it. I would rather get a B than transparently work my professor for an A- and it's concerning to think that the people who go on to become doctors and management consultants are disproportionately the ones who do that.