One more thought, say 300BB is the min. to never go broke. Now, before moving up in stakes say from 5/10 to 10/20 requires twice the BR. Then on the flip side if we just start out with our 300BB at a 5/10 in the big blind and fold, now we have 299BB and need to drop down in stakes...that is BS but that what is being implied by moving down in any case.