Not to be contrary...
But the whole concept of "Cash Back" is smoke and mirrors.
Business run on costs, expenses, and profits. All this equates to higher hidden costs in the prices of the good or service purchased because the business is charged usually a per-transaction fee in addition to a percentage of the transaction by the CC Company.
That means the aggregate cost of goods and services is higher because the providing business has baked CC transactions into the selling price. It's the cost of doing business.
Now convenience in making the transaction and single point review of charges on a single statement have a worth to the consumer. No doubt, but let's face it we really don't get money back when you think about it. And the overall result is higher purchase prices.
WW
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DISCLAIMER: We also use a low limit (~$1000) for routine purchases and pay it off with no month-to-month interest. That doesn't mean that the "rewards" are free money or that the goods were actually cheaper.
I would love to see businesses be required to add to receipts a separate line item showing electronic payment markup + CC Cost as part of receipts so that consumer actually understood the financial transaction.
For example I recently scheduled renewal of our HVAC maintenance contract. The cost is $200. If I pay by check the cost is $200. However if I pay by credit card the cost is $207 to cover electronic payment.