Nah, some people don't brumate their corns and they still get them to mate and lay eggs and all that.
I think some of the bigger breeders do it to mainly get a break from feeding and stuff...but also they get the males' and the females' reproductive cycles on a similar time schedule so they'll have better chances of having successful matings and getting fertile eggs and stuff. I think I read that in the CS Manual...not sure though.
Some people still brumate their snakes even if they're not planning to mate them. I probably will do it this coming winter and I'm not planning on breeding him anytime soon.
Hope I answered you question..sorta