The library staff definitely knew about it. I felt bad originally for booking private study rooms for work, and not "private study"; I was vigorously assured that I shouldn't feel guilty for doing so.

Two things to realize:

(1) The library staff is a lot more nervous about the library being empty than they are about it being full. Something about busy libraries being the reason they get paid.

(2) If libraries have headache clientele, it's the homeless. I had no idea what a mess that situation was until I started going to the library every day.