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Not at all. In fact, just the opposite.
According to Rodney Jean, who heads the bankruptcy division at Lionel Sawyer Collins, Las Vegas’ most respected law firm, markers are like promissory notes. As such, not paying them can open you to bad-check charges –- and the Clark County District Attorney is quite vigorous about enforcing this, although high rollers with multimillion-dollar debts are the DA office's preferred targets, since they take a cut of the money recovered.
But, Jean says, there is no bankruptcy exception that prevents you from writing off casino debt. He does, however, cite a different motivation for making good on your markers: "Any reasons that you want to pay the casinos might have to do with how much you want to gamble [there] again."