I think the categories that Audiogon currently has seem just about right. Too few, and you end up skipping over too many threads you aren't interested in and missing ones you might have enjoyed reading or contributing to. Too many and you waste a lot of time going back to the top nav to click down into the sub-forums you want to read.
Of all the audio forums I frequently view, Audiogon's structure is my favorite.
Of all the audio forums I frequently view, Audiogon's structure is my favorite.