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It's crazy isn't it? A few years ago I actually invested in a few LEGO sets and they are now worth triple what I paid for them. It doesn't make any sense to me, but collectors are a passionate bunch!!

Yeah, that's for sure. One of the biggest ROI I've seen in collectibles, is some of the demonetized coins from countries that adopted the euro. For example, in ebay the 1 drachma greek coin can be sold for, say, 0.20$. Now, it's face value was like 0.003$. So it's like 66x from 2002.