Having a cold

It's not pleasant, and I couldn't help but notice how much snot my nose feels obliged to produce. At a rate of 1ml/min. (at its peak) that's a lot of mucus.
The sinuses, in total, seem to have a capacity of about 30ml, meaning that an hour into a cold they'll all be utterly full and the pressure will start to build. It's not helped by the fact that the maxillary sinuses have their drain at the top of the sinus, making drainage impossible when the head is upright.
It feels, however, more like the frontal sinuses are the ones causing the pain, since they're the ones in the forehead. Why that might be I don't know. Perhaps the inflammation up there has more sensitive tissue against which to push.
I wonder whether people with big sinuses tend to have an easier or harder time with colds. If sinuses developed to protect from blows to the face then men should have bigger ones, and this might explain why they find colds so much more unpleasant, if bigger sinuses lead to greater pain. On the other hand, it hardly seems likely that we'd suffer blows to the face much more often than to the rest of the head, and we don't have rear sinuses.
I'm not sure that sinuses are particularly helpful with humidifying and heating inhaled air, since they're connected to the nasal passage by such small holes. That makes it difficult for air to circulate into them int he duration of inhalation.
They might insulate delicate facial structures from temperature fluctuations, but given that we don't have them anywhere else, we have lived our lives in temperate climes and no-one seems to notice problems from breathing cold air through the mouth, I don't like this answer either. We could test it easily by examining humans from different environmental backgrounds.
That leaves the possibility of sinuses giving the voice resonance or being necessary for making the face lighter. I can't see any value intrinsic in having a lighter face; the ease with which one might make facial expressions will hardly be changed by having lighter bones in the upper part of the face, since the bones move little if at all.
Resonance is a nice idea. Is it worth having a resonant voice in exchange for regular sinusitis? Is sinus size related to the pitch of a person's voice?