Actually, some rotary Vne limits are set because they cannot be reached without a ridiculous rate of descent being reached, so why bother going faster. eg EC-155 Vne 175 kts, manufacturer has taken it to 210 kts and the head/blades to 240 on a dauphin.
On the other hand, they also take into account the wear and tear on the controls and hydraulic servos; ie componant life consideratioons.
I don't think one can consider exceeding Vne or any other FLM limit deliberately without snagging the aircraft after; not really fair on your colleagues, or you the next time you fly it, really?