WTB posts haven't been very successful for me here, but that's b/c I'm looking for tough books. I don't know that we'd want to impose guidelines as to how WTB posts should be formulated as most collectors will consider various combinations of grade, eye appeal, price, and page quality in determining what they'd pay.
It is worth noting that there have actually been quite a few WTB posts recently, so the idea of a separate WTB forum may carry more weight now - I know that the last time we discussed dividing up the forums you decided not to break them out as there just wasn't enough volume to justify it, and you didn't want too many sub-categories in the marketplace.
I think this would help since most WTB posts get pushed to the bottom of the viewing list within a day, if not a few hours. Having one spot to look through would make selling easier if I can match a buyer to a book instead of throwing it on ebay.
I agree, I've posted WTB, and they get buried very very quickly. I've had a little luck, so it's definately a nice thing to be able to do.