Originally Posted by
Checkboard
I would imagine that it’s more: If it was achieved by multiple pilots, then the procedure is not only cheaper, but also robust in terms of engine damage. If was achieved by one, then some specific training may be required to make it that safe, and if you are renting a plane to multiple pilots then it might be best to require ROP ops to avoid damage. $100k over 1200 hours is great, but easily soaked up by a ham fisted pilot detonating an engine.
Most 'big' piston engines will run happily and healthily in a state of mild 'detonation' at most high power settings.
'ROP ops' might 'avoid damage', provided the engine is far enough ROP. But if it's not far enough ROP, that's where the biggest risk of damage arises.