I don't know how you make your calculations but they don't sound right. They can be right only if you have free electricity and by 12 dollars daily as cost you take your initial investment at the price you bought the rigs or mining devices.
Nowadays conditions are not worthy anymore, even at the 0.09 dollars/kilowatt energy cost. My colleagues turned their rigs off because one rig with 6 Rx 580 was making 0.0036 bitcoin weekly and 0.015 almost monthly, that is only about 90-92 dollars, they paid energy for a rig 80 dollars so for just 12 dollars monthly profit was not a good idea to keep the rigs on, not worthy.
This is the big picture in Gpu mining nowadays.
Nowadays conditions are not worthy anymore, even at the 0.09 dollars/kilowatt energy cost. My colleagues turned their rigs off because one rig with 6 Rx 580 was making 0.0036 bitcoin weekly and 0.015 almost monthly, that is only about 90-92 dollars, they paid energy for a rig 80 dollars so for just 12 dollars monthly profit was not a good idea to keep the rigs on, not worthy.
This is the big picture in Gpu mining nowadays.
This is my big picture
...well its a 25 days old topic , check my calculation All my rig are with optimized bios with the right undervolting overclocking ,not with those one click bios modes, with real bios mode , hex editing, optimized for low power usage/highest possible hashrate