[umdpoker]

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However, I'm sure most of the forum could find a hand history example where some short-stacked player with AA got all-in preflop against some deep-stacked player with KK or AK or QQ. In that hand, shorty has stunted his winrate, pure and simple.

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one of the advantages of shortstacking is that deepstackers sometimes can't adjust correctly to decent ones. (i am referring to 50bb shorties, not 10bber's) whereas most players won't go allin for their full stack with aq/jj, they see your short stack, and think "hell, its only half my stack, and this guy must be a donk because he buys in short. call." then they realize they are crushed. i have had some players i thought were decent call me with hands i know they wouldn't if i were full. sets almost always get paid off in limped pots by tpgk. if i had more behind me, i am certain my turn bet would be folded to much more often, because they fear the big river bet is coming too. basically, if you play under your opponent's pain threshold, they will pay. the key is to change your play once you double up. those who don't realize that you change strategy once you get to 100bbs then make more mistakes, thinking that you always play tptk for stacks. this makes them overvalue some hands, and not put me to the test as much, because they don't think i can fold strong but not great hand. it is very nice to have opponents misunderstand my play. i agree that you will make more with a deeper stack against bad players. that seems sort of common sense. however, buying on for 50 bbs isn't as bad as you think, simply because there aren't many 100bb pots anyways. i don't see how it is possible for the 20bb/less shorties to make any money, since they can't play postflop at all. they are also forced to take a lot of flips preflop(or the blinds take too much from stack between good hands), which basically feeds the rake.