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3) 4BTC? 5 S1's cost ~4.96BTC, have less chips and no PSU. This ain't a charity.
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It still has to be a valid purchase though, the S1's made that and returned ROI reasonably quickly @6
BTC ROI will be 9-10 months away.
I'm not saying that I like or dislike the S2 pricing, just that 4BTC didn't make sense as a talking point.