Mining is never worth it if you spend btc to get btc...
It's only worth it when you start join the game spend some fiat to get btc.
Even with the best ROI machine in the world the S1..you will never see ROI.
With the coupon it's 0.8 + VAT + electricity...mine it forever you'll never see that 0.8 back mining.
Maybe in decades when it becomes an antique then you could sell one as a collector item for some btcs.
Really? That's odd because because I have 8TH running right now that has already paid itself off in BTC.
They key is being able to do basic math, only purchase in stock hardware that ships immediately, and not overpaying for hardware in BTC terms.
There have been a couple of times in the last few months where the S1 was a screaming buy (hint: the sooner you buy after a nice price cut, the better), but now is not one of them...
In fact, I see no mining hardware that is worth buying at the moment. If BTC spikes in price, hardware will become profitable again for those who already have BTC that they can use to buy it.