ORIGINAL: kevin1

Who cares? The deer won't die any faster. Aside from that, there's still such a thing as a point of diminishing return, a 400+ FPS bow would undoubtedly cost more than a 300, yet it wouldn't do the job any better. Same holds true for KE, once you have more than enough to penetrate any animal fully anything more is just expensive overkill. The bows we have today are already way more than anyone needs to take down game.