Depending on the casino and the machine, card pulling may or may not work to
mask a win. If it does, one should use it cautiously, because some people
have reported being barred after using excessive card pulling. I sometimes
put my card in and out to make sure points are accruing properly (this can be
an excellent idea), so that is a good excuse as to why you pulled your card in
and out. But obviously one would only do this occaisonally, not every hand
or every 10 hands. At some casinos I've found pulling the card in and out
can actually result in higher win totals, for unknown reasons, so if you try
it, just try as an experiment at first, and then be very very cautious.
By the way, you will still receive all your W2Gs and should report all
income and losses to the IRS. Presumably the main reason for pulling your card
would be to increase your loss rate only for the casino's benefit if you felt
it might help you get more comps - for example at a casino which looked at
your overall loss rate as being more important than your theoretical average
rate.
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