I tried to get rid of my yellows in my stash and noticed that the lowest buyout prices for many of the useful (primary stat/vitality/sockets) rares were typically under 1k.
The only thing that seems to be worthwhile auctioning are rings and amulets.
I'm actually fine with this, as vendoring is a whole lot less hassle.
Is there a niche market I'm missing among the non-Inferno items?