From Wired:

There’s more than one way to make money from the Bitcoin craze, which has seen the value of the digital currency increase more than six-fold over the past few months. You can do it the old-fashioned way: buying low and selling high. But for the sophisticated digital-currency investor, there’s a whole other world of Bitcoin speculation: the Bitcoin mining rig.

Like the currency itself, this strangely lucrative game is heating up — in a big way. One mining rig — available for preorder at a cost of about $1,800 in February — is now selling for more than $22,000 on eBay. And it hasn’t even shipped yet.

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