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I've thought of credit cards as having some collectible potential some day
I've thought of that, too. But with all of the present-day concerns over identity theft and what not, I decided against it, as I wouldn't want to sell a credit card as a collectible if I'm endangering my identity (or someone else's) in the process.
Actually, I have an old Getty Gas Credit Card I still keep when they had their own gasoline credit card ... it's about 30 years old now, so I suspect it's something of a collectible.