That, JennyO, is because Mother is in control. Mother doesn't like order. Mother doesn't like things to be nice and neat. Mother doesn't like anal retention. Mother does, however, love the Second Law of Thermodynamics and, of course, entropy. In fact, Mother has the Second Law of MOAB: BS will always flow from states of higher to lesser density. Expressed mathematically, this would be

                         S1>S2=S3=S1+S2/2

or, in words If BS state 1 is greater than BS state 2, then BS State 3 results, which is equal to the total of S1 plus S2 divided by 2. Since, by definition, you can't in this Universe have more than a state of greater BS and a state of lesser BS, no more than two states are possible or even desirable (some would argue that one state is too many).

Amos's recent work in multi-dimensional BS entropy, however, is quite exciting (if you're into that sort of thing), showing as it does the probability that alternate states of greater and lesser BS can and most likely do exist, but in places where we can't see them. Sort of like a transdimensional game of hide-and-seek, only you can't see either the other players or where they are hiding. I'm certain that he'd be as happy as a pig in mudtime to post his work here if you were to ask him to do so. Be sure to ask him sweetly and nicely, because he's usually a surly old burp. You won't understand it -- heck, not even Amos understands it, having done most of it when he was drunk -- but it certainly is interesting to see all them mathematical squiggles and stuff.