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Is this a store card or an actual credit card? I know you said "CC" in the thread title but... If it's a real CC then I don't see any excuse for such activities. Even if money is tight you can surely afford a few cents. An Amazon e-giftcard is as cheap as $0.50. Go to a gas pump and pay for a few drips of gas. Do you not buy groceries? A single fresh cucumber is cheap, and it makes a satisfying thud when you use it to thwack people who return stuff.
If it's a store card though I can see the temptation. When you use a shopping cart trick to get a card for One-Eye'd Willy's Glass Eye Shop or something, you feel kinda stuck all of the sudden since nothing costs a buck there. Kinda creepy going in the store, too.
I don't think your approach would work for long.
P.S. it looks like someone stepped on your little seedling
On some of the cards I don't use frequently I keep a small recurring charge scheduled on them every month (Netflix, gym membership, Wine of the month club, whatever works for you) and then have the cards set to AutoPay so that I don't forget to pay. It keeps them active and AutoPay hasn't failed me yet!