It's relatively easy to make a case that certain classes of cards likely will retain their value and may appreciate, but to try to justify specific card purchases on the ground that they are a better "investment" than other places one might invest the same money would be an exercise in sophistry that won't get past your wife. I think you need a new paradigm here.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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