Like I said people are or want to be stupid. ROI right now is almost 24 months and if nothing wrong happens to your system, It is impossible to make your system to work 24/7 everyday and plus, calculations on websites is something, calculations in the end if it was profitable is something else, people saying they will get their money back in less than 15 months are liars. Stay away from mining and if you have money, invest in coins cause the way things are nobody that is mining is stupid enough to sell at current prices.