I can sort of see adding connections and adding travel time on Sunday, if there really is nothing of interest at your final destination. But if there's anything remotely of interest, I wouldn't want to do that.

A mileage run to put you "over the top" could definitely be a reasonable use of money and resources.

But I'd still say, in general, arranging one's schedule to add extra miles and hours does not pay off on a dollars/hour basis.