It makes sense. The ~$10 someone saves pumping at Costco is easily made up in the >$100 shopping trip they are making, or compared to lifetime spend.

No it doesn't. Costco has a gross profit margin of 11% and a net profit margin of 3%. Losing $10 to make $3 isn't viable.

	▲	basch 7 hours ago \| parent [-]
		Costco isnt losing $10. They can sell gas at cost to run a gas station if they want to. They break even and get people there instead of a normal gas station.