1/2 kW/minute costs about $0.001 so you technically could make a profit at that rate. The real problem is the GPU cost - a $20k GPU amortized over five years costs $0.046 per second. :)
How do you get that? I get $0.0001 per second over 5 years to reach 20k.
Because I'm an idiot and left off a factor of 365. Thank you! A 20k GPU for 30 seconds is 1/3 of a cent. Still more than the power but also potentially profitable under this scenario informing all the other overhead and utilization.