Honestly, I think all the WD sketches are vastly overvalued. I collect all kinds of sketches and have dropped plenty of dough on them, but I won't touch these.
Reformed sports collector/seller, now strictly collecting non-sports sketches and loving it! - | - I no longer sell cards on eBay or through here. I will consider trades.
My sketch collection: http://sketchcollectors.com/gallery.php?user_id=727