If you make a purchase with a Chase debit card you have 2 options, use a PIN, and run as debit, or no PIN and run as credit. Now Chase encourages you not to use a PIN by giving you reward points if you run as credit. These reward points can be cashed in for pretty decent things. Every year I cash in and have between $200 and $300 in Target gift cards.
So why do they really not want people to use PINs? What’s the SD?
PINs have nothing to do with it. They want you to use a credit card so that you can pay interest on the balance. That’s much more lucrative for them than using a debit card.
I can’t speak for the U.S., but here in Canada credit cards are switching over to use a chip-and-PIN system (i.e. eventually you’ll have to use a PIN with your credit card anyways).
But the money is pulled straight from the account like a debt. There is no interest.
I mean debit:)
Merchants pay the credit card issuer a higher interchange fee for processing a credit card transaction instead of a debit-card transaction.
The interest paid by the consumer for a credit card debt is a separate way for a card issuer to make money off credit cards…
O.K., that’s just weird then. 
I guess it must be the higher fees as Chief Pedant is saying.