I'm reminded that I know nothing about them every time I see a handlebar thread. I've searched, I've read thread after thread, but there's still something I don't understand.
I'm using Nashbar "Oversized" drop bars which I selected simply because, other than about 50-100 grams weight I didn't know of any advantage for the more expensive ones. I don't even know what "oversized" refers to - the clamp diameter is standard, the reach and drop more or less normal. It seems comfortable enough - I have about 3000 miles with it - and if it has ever flexed I didn't notice.
Nashbar has a number of choices, a large range of price including a couple of carbon fiber bars. Disregarding the CF bars, what makes one worth more than the other?