No, you should not declare the cards as Investible Income like gold coins. To be clear, the sale gold coins is taxable.
Although you don't think so, the IRS does consider you a small business, and you should enter your information on a schedule C.
Please be aware that you will be charged income tax on your profits, and self-employment tax. The self-employment tax rate is 15.3%. That rate is the sum of 12.4% for Social Security and 2.9% for Medicare.
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