I had both comp lit and pharmacy up to about 400, and it was ip cheaper for me to raise tutoring for the first time and get the benefits of a device, than to raise both those skills. What I mean is that 10 points from 2 skills above 400 probably equals a couple of hundred points in tutoring if it hasn't been raised.
Both comp lit and pharmacy are skills I only need once in a blue moon, so it doesn't matter that they're not permanently buffed.
Tutoring is definitely worth it, I just wish I could make a heap of cash selling it to people