Someone said it already, the weight range is too large.
Anybody walking around at 230 or less, it really just makes sense to cardio down to 220ish, then cut to 205.
So your'e talking about guys who are so big at 230 plus, and so muscled they can't cut the weight, that they're probably playing another sport if they're a good enough athlete to fight professionally (Big Country notwithstanding).