Why does NSW require PWC riders to wear a lifejacket at all times, unlike some general boating situations where a lifejacket is only compulsory beyond a certain distance from shore?

1. Because PWC are legally classified as always operating offshore
2. Because the higher risk of falling off a PWC at speed means the 'at all times' rule replaces distance-based lifejacket rules for PWC
3. Because PWC riders are exempt from all other lifejacket rules
4. Because PWC lifejackets are cheaper, so requiring them constantly has no real cost