That's a tough question that really depends on what you're selling to who. There's a lot to be said about not needing/wanting to know something. It's liberating on a level you probably can't imagine, but how practical is it? Does your ear need to be all the way to the ground or can you listen a few feet up? That's what I talk to Bogus Handzel, of Handzel and Associates, about as he figures out how sharp it should be. P.S. Agency Nation University can sharpen all kinds of swords for you.