if you have a fast IMC machine, and all the ratings to go with it, sometimes it can make sense, as working hard has said.
if i want to fly VFR from my home in hampshire to say, nottingham, by the time i have driven to the airfield, taken off the covers, prefilighted, fuelled etc, i could probably have got there by car at about a quarter of the cost.
so my flying is purely because i can, and the satisfaction it can give. it will never make economic sense to me.