[pokergrader]

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You make a lot of valid points, but you are missing one obvious point. Making a computer play chess well uses tons of processing and computing power, which given the time constraints leaves very little "extra" time for doing other advanced strategy calculations (even if such a thing existed).

Poker on the other hand is very simple to process. The computer can practically spend all its time categorizing opponents as processing the statistics on the cards is trivial. It can create a moving graph of the aggression of each opponent, and track changes over the long-term or short term. It can detect "bad beats" just as easily and you can and perhaps turn on a tilt checker and check that opponent for drastic changes in play.

I'm not sure exactly how well its been done, but it is clearly possible with todays very powerful computers, you just need a good programmer teamed up with a good poker player.