So right now, bitmain a3 with 815ghs is doing $30-$40 per day, and when it started, it was $500. Also keep in mind there are 300+ units to be sold and will soon be in the network and that will take profits to $15-$25 per day. So the only one that earned a lot of money is bitmain ehhe

So right now bitmain is selling them for $2375 which means 2375/30 = 80 days to roi. It still looks pretty good compared to gpus. If it crashes to $15 then it will take 160 days which is till better than gpu mining.