740 USD will be the total including taxes. Today a Z9 mini manage 28 USD overclocked to 16000 sols with the BTC price around 6000.  Is the risk really that high that i wont ROI on this investment ? The difficulty has to go up 8-9X for this to happend ? And im not even debating a price increase of BTC then.  Even with an average of 5 USD per day the ROI is 5 months.
Am i being to optimistic here ?