I got this reactions lots of time; but most of my characters have this kind of skills both among Active and Knowledge ones.
As far as I can remember, at least half the knowledge skills points of every character I ever made had "almost" nothing to do with running the shadows. The almost is just there since the shadows are a really inpredictable place, and sometimes the most strange skill can prove itself useful. also, almost all my characters spend a little something to get a skill non-related to running the shadows; my most min-maxed character ever has it as his rating 6 starting skill (Digital Art), and it even has an specialization. That's 26 BP into a flavor skill, and it was really worth it!