I disagree Rag, I think charges are called too often in Australia (not just the NBL) when the defender isn't displaced, rather they take contact at the spot and let it take them to ground,and also when the defender has established legal guarding position.
If you watch the NBA or European basketball, once the defender is beaten they tend to open their stance and defend alongside the ball-handler, relying on help defence behind them.
In the NBL defenders are far more happy to create contact in that situation knowing there is a good chance they'll get a charge call.
The same goes for elevating players. In the NBL a defender who steps in after the offensive player has elevated will rarely be called for a block, they'll usually get a charge or no call. In the NBA and Europe the elevating player is better protected.
The two factors mentioned above - along with how blocked shots are whistled - encourages a more athletic game in Europe and the USA, whereas in Australia the safest defensive play is to get contact on the ground, and the smart offensive play is not to elevate at the basket.