I'm relatively new to this community, so take this with a grain of salt.
I have no problem distinguishing between items in the classifieds. Subjects clearly indicate the item being sold/traded/bought. Also, this can lead to a slippery slope. Why not split out switches, cables, and so forth?
I like being able to peruse everything in one place. If anything, I think there could potentially be more consolidation, like auctions and group buys into one stream, so all sales regardless of type can be seen in one place.