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This comment sums it up: "Performs as advertised; WILL NEVER PAY FOR ITSELF. Interesting piece of history."

> UPDATE: as of September 4, 2013, these will earn about 0.0019 BTC per day or about 0.057 BTC (approx $7.50) per month.

So, if you get it cheap enough, and run it off someone else's electricity, and the cost of bitcoins is high, it might just pay for itself?

Good point; At the level that BitCoin is currently, I wonder if this might indeed pay for itself, in the very least?