These statistics are a little old, and as always, statistics usually misrepresent data in some way.
According to this article (
American Household Credit), 46% of households in the U.S. had an outstanding credit card debt.
Data was sourced from U.S. Census (2012), Aggregate Revolving Consumer Debt Survey (2015), Survey of Consumer Finances (2015).
The article states the average amount of debt to be ~$7,500. I will assume that the rewards of the cards are not enough to offset the the interest accrued over the lifetime of the credit card.
So, if you have a credit card, are you one of the 46% that are currently (or will be) in debt? If so, I personally do not believe the rewards from the credit card are worth the expense.
This report doesn't cover worldwide stats, so there is definitely room for variation. 46% is pretty high though, damn near 1/2 of everyone posting here (assuming you fit the demographic) should probably not be using credit cards for the rewards. A lot of people say they would never carry a credit balance.