Per pull? Really? I always thought casinos were dumb, but how could they be that dumb?!
A slot machine is basically a money-making skinner box.
Blackjack with basic strategy (no card counting, just some 0 memory rules that would fit on a 3x5 card) is a narrow edge for the house, as is craps.
Some time ago, I remember reading a talk given by a Las Vegas casino operator during a conference on risk. They analyzed their top ten largest losses for the previous year, and found none of them were associated with their gambling results. The events that actually cost them were completely unrelated occurrences, like their resident entertainer getting savaged by a tiger, large fines from the gambling commission because of an incompetent employee, and so on. The gambling side of the business generated remarkably smooth results.
(Look on page six, where it breaks down the 'win percent', or the house edge, by the stake size)