I can't speak for Australian companies, but here in the US--yes, it is also the insurance companies.
When I lived in Michigan, with Satan's Own No-Fault Insurance Laws, nobody claimed anything on a car unless it was pretty much a total loss. Because there was no other party to collect from (no fault, right?) if you made ANY legitimate claim, you could be expecting to pay it back in spades when they jacked up your rates next chance they got. So everyone had very high deductibles; you didn't dare report an $800 loss anyway, why not have a $1000 deductible?