As far as "aerobatting" helicopters goes, during my time as a heli display pilot, we were given a presentation by Westlands, who were also overseeing the "fully aerobatic" Lynx displays.
They were very keen to point out that flying any helicopter outside of its approved/certificated flight regime has an extremely detrimental effect on the fatigue life of major aircraft components, irrespective of what the pilot senses. The display Lynx was subjected to a much increased inspection regime and early major component changes. He also pointed out that the failure is unlikely to occur during the manoeuvre in question, but some incalculable time afterwards, so another pilot might become the unwitting victim of some pilot who has horsed the aircraft around for fun.
The type I displayed was later damaged during a display (tail rotor blades damage; not by me) and following investigation and evaluation by Boscombe Down, the display was banned.