Gas sales are (almost) a loss leader to get people in the door to buy snacks, drinks, smokes, and lottery tickets. Mattheij's generator had enough juice to run the pumps, registers, and half the freezers. How does the cost of installing and provisioning a generator compare to the cost of a few days of zero sales?
And not just a few days of zero sales they went through a whole month's worth of gas in that period and presumably sold through a fair amount of their non gas inventory as well.
