Their costs are lower, so they offer it at a lower price to encourage more people to buy it. While still having a higher profit per unit!

That's normal business behavior. Why would it have to be "charity" or some kind of fake "PR stunt"?

spoken like someone who’s never been to a gas station and seen cash and credit charges at the same price.

Do some do it right? Sure! A lot will pocket the extra profit.

That's only a couple percent, and credit card companies get all fussy if the prices are different.

If it was 30% you would absolutely see gas stations advertising a hot deal 20% lower cash-only price to draw in customers.

Right, companies have fixed profit rate and they lower the price when the costs go down. Got it, thanks. Great business tip!

When costs go down, and profit margin increases, the price point where a company can achieve maximum profit also goes down. This doesn't require altruism or stunts or a fixed profit rate.