Sure? lol
You dont buy insurance for this, your normal insurance will most likely be void for the event - check with your insurer to confirm that though
The insurance to be honest is mainly to cover the event co-ordinators (myself and the other nsw execs) if for example, you have an accident and want to sue someone for damages/whatever. It protects us against you driving beyond your ability, crashing, then blaming us and trying to get us to pay for your wrecked car.
If you wreck your car its your issue, no one elses. With that said, we have not had a crash at any of these events and the course is setup as safely as possible. Before each group starts i will be driving around a sighting lap, just so each driver knows what to expect
This is a commonly accepted fact for almost every event where you drive faster than normal road conditions
Regarding doubling up: It means 2 drivers can share one car, but each driver has to pay, enter, sign forms, wear a helmet, attend drivers brief etc