They don't 'lose' money unless the margin is less than the ~2% visa charges, which isn't bloody likely. They do however lose profit.
Actually, in a CC sale, if the item purchased is cheap enough, it is possible to lose money on the sale.
Take the .50 pack of gum one poster above purchased with a CC.
Merchant discount rate which is the fixed percentage amount deducted from the purchase cost.
Right now, the average for retail establishments is around 2.1%....so let's say 2% for simplicity. But this only works out to .01 on a .50 pack of gum, so it isn't the factor that loses the merchant $$.
So, it's the
merchant transaction fee. In addition to the discount rate, a transaction fee is also deducted from the purchase cost. Today, the typical range is between .20-.50 per transaction.
If the merchant isn't at the absolute bottom of the range that's currently found with today's merchant accounts, the sale of the gum just lost the merchant selling it $$, even if it's only a penny or two.
And the Brinks truck pickups and dropoffs comment above made me laugh. It's only the most major of businesses or chains that utilize that sort of service. Unless you're Bloomingdale or Macy's or Fry's or the like, you're doing your deposits and other banking in person or using a night deposit.