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What are the reasons to get more than one credit card?
In the case of reward cards, different cards may offer different rewards for different kind of purchases. For example, in the UK, one of the Amex cards offers 1.25% cashback on all purchases, whereas one of the Santander cards offers 3% on fuel, 2% or 1% on certain other transactions, and nothing on others. Of course, you then have to remember to use the right card! Another reason is that a person may use a card for a while, build up a good credit limit, and then move to a different card (perhaps because it has better rewards, or a lower interest rate, etc) without cancelling the first. If it costs nothing to keep the first card, then it can be useful to have it as a spare.