I have done this in the past...and continue to do so...but honestly it hasn't proven to be a great strategy for me as i usually sell/trade them for pretty close to what I have paid for them when I tire of having doubles in my collection...or desire to raise funds.
But there are a few cards I will hoard any opportunity I can just because I know how tough/undervalued they are...and hopefully someday someone will need them!!!
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