Daily profit is not the only thing concerning while buying mining equipment. There are many other factors like electricity cost etc, Because the price of electricity decide your  profit. You don't specify the country for profit but let me tell you profit average in U.S.
   Period           /day                 /month                 /year
Income          $4.71              $141.27                     $1,695.27           
                     (0.0007 BTC)     (0.022 BTC)             (0.2649 BTC)
                                                                         
Electricity       -$0.94              -$28.08                      -$336.96
Profit        $3.77             $113.19                      $1,358.31


source https://www.asicminervalue.com/miners/bitmain/antminer-z9-mini