When you end up having to replace parts before they are due and owners complain about the manufacturer, no one has a record of every time someone has pushed the aircraft whether it be weight or unnecessary flying (whilst not exceeding the flight manual). While one wingover may not cause noticeable decreases in service times, a culture of doing so will.
There is no way to empirically measure that apart from looking at the maintenance history over a period of time.
Maintenance deviations aren't only a result of exceeding the FM, how an aircraft is used within it's operational limits is a contributing factor.