Well, see Barit, that's where your argument comes undone.
Keeping costs down in a flight operation is a matter of containing costs in a number of areas...
So pulling back on the power for departure might extend engine overhaul times, but flying around at altitudes not optimal for the trip burns more fuel right now...we could go into insurance, training costs...and for me...pointless..
Reminds of when the ex CEO of United blew 100 million on non refundable aircraft orders and almost bankrupted the company...
I won't argue that power reduction can save overhaul costs, but chances are, that procedure in an organization that is probably bleeding money in other areas is like the kid who put his finger in the dam.
Feel free to fly it to fence if you want, but unless I was convinced that the rest of the organization was as motivated in their efforts to save money, I wouldn't put any more runway behind me then necessary.