A very small percentage. I collect mostly for fun and the hunting down of nice clean examples for my sets. However, when it comes to the keys, which can get pricey. its a little different. With those, I try to get the best possible specimine that I can afford, and try to get it slabbed if for no other reason than for peace of mind that it is what it is and its most likely genuine. So those are in a way an investment for me.
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Jerry