Hey
The PSO's are enforced, given the choice no one would operate those, they're dreadful. To top it off there is no subsidy given, anywhere else the gov would be underwriting the cost to soften the sting.
RUH-DMM "most profitable route" ?? very much doubt that even with if there was a 100% LF those are domestic sectors with fare caps imposed.
The profit is to be had elsewhere.