Hey Jim, 

There is no doubt that the more often the better. But when it comes to a commercial outfit, with one or two thousand hives or more, then you add in five or six thousand supers to rotate comb out of also ,it becomes a large expense.
  Now I know there are those that will now say you can't afford not to but add in CCD losses ,a poor honey crop , high fuel, much higher feed ,it's easy to not get it done, and still stay in business.
 Back to point one, it is the number one best thing we can do ,but most guys,other than small beekeepers find it hard to stay on top of. Most of us are now trying harder than ever to rotate ,,but  Farm Credit and the other guys like to be paid on time.Speaking for myself it's hard to get caught up and not  go further in debt to get it done across the board.
  I feel in the past alot of folks haven't put alot of focus on it .

****************************************************
* General Information About BEE-L is available at: *
* http://www.honeybeeworld.com/bee-l/default.htm   *
****************************************************