i think they are just out of style right now frankly...
as i understand it, the bowie was originally intended as a general use camp knife for skinning/butchering and light brush clearing, and just happened to end up in a fight one day.
i would not mind using a bowie in the field if i needed one, but i don't really need one so don't use one. i would certainly use that marbles though, it looks like a very no-nonsense knife. i don't know if i would call that a bowie though, more of a camp knife style with a clip point. bowies generally have larger gaurds, often double, and have longer clips, at least as far as i can tell.