You don't understand what are you talking about. Mining on 1 GPU is not profitable now. That's it.
OP doesn't focus on electricity although you mention an electricity cost effect to profit, but a problem primary not that. let's focus on a specific problem although I know problem profit can be influenced another factor and OP has been confirming:
Sorry @dimsk but I just want to stay on topic on my questions and you advising on the power consumption factor wasn't helping answer my queries.