ROI is possible if BTC reach USD 850 and above.
So just buy BTC. Then when BTC reaches 850, you'll be at +75% ROI, rather than simply break even.
Miner ROI should be calculated only in BTC in order to discount BTC exchange rates.
So, fiat priced miners are "cheap" when BTC is high and "expensive" when BTC is low.
Therefore it is best to buy BTC when BTC is low and buy miners when BTC is high.
All IMO, of course.
