I, too, wear the hair combs in my collection; keep them stored in a large silverware box, lined with velvet, which I've gerry-rigged with small bunjis to hold and protect the combs.
I love my combs, but have gathered them with the specific goal of wearing them.
It doesn't bother me to see off-kilter combs displayed, but they should be done artistically so - not where it looks like they were simply tossed into the frame any which way, covered and hung!
Having them all straight and prim would be a bit stagnant, for me, as I like the appearance of motion and movement, the flow of one finely crafted piece into another, drawing the eye around in an entertaining manner.
As it hangs right now, I know those combs are embarrassed to death! ;o)