Does a Ketogenic Diet Make Sense for Fighters?

Extremely low carbohydrate diets like Paleo and Ketogenic diets seem to be very popular these days. Quite a few crossfitters and other "hardcore" fitness folks espouse the benefits of significantly cutting your carbs.

I've noticed that there are a lot of martial artists and combat athletes who are jumping on the bandwagon too. Some of these guys swear by it. But is a ketogenic diet really the best dietary approach for fighters?