However Widowing a BvB is damn boring. I've done that once (killed a ghetto BvB with pure Widowing), and ever since I've not done it again. It just takes too much time to be worth all the wasted arrows.

Plus BvBs are not of any concern unless you look for bragging rights since 98.9% of them play in specific BvB games only, because in the end, BvBs are trash versus anything but barbarians.