I've occasionally bought a second copy of something by accident, but never so that I can keep one in mint condition for investment purposes. When I end up with two copies by mistake, I usually give one of them away.
I buy all sorts of SY crap for completism though, just as a kind of an ongoing challenge to myself to keep the collection... erm... complete. Does that count as buying for collectibility? Or just nerdishness?
For the record, I am currently losing the completist challenge.
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