I love this topic because it is, in fact, free money.
I'm another credit card user, I juggle 5 cards to try to optimize my "cash back".
One of the common questions and misconceptions about cash back cards is that
credit card issuers are setting a trap to get people to carry a balance and pay
interest and that is what funds "cash back". If you do the research, that really
isn't the case. Of course, CC companies are happy to collect interest, but the
financing of "cash back" is actually more nefarious than trapping unwitting card
holders into debt. Credit card issuers have managed to become so entrenched in
the payment of transactions that all transactions have a hidden fee to pay for
credit card usage - whether a card is used or not. Credit card issuers have contractual
language in the merchant agreements that prevent charging less for cash transactions.
Gasoline is one exception, but there aren't many others. The "cash back"
people love is actually just a return of a built in charge. The nefarious part
is that even people who don't use cards pay the hidden fees.