just my opinion...
if they put S3 below BTC1
then what'll happen with the S2 buyers?
well, i think bitmain will adjust the price above BTC1
about ROI, if u want ROI in the short time (1month? 2month?), well, u'll richer than bitmain
if i'm Bitmain, the hell i care about ur ROI, its about risk, afford what u can lose
big profit always followed by big risk

if in the end u cant ROI, re u going to blame Bitmain too? nah they're not ur friends who'll make u rich bro...
the damn they care