Also, to all those claiming that insurers are blatantly profiteering, look up their combined ratios.
The Admrial group, who I believe rather a significant proportion of people on here utilize, and are considered to be by far and away one of the best insurers for young drivers (me included), report a combined ratio for the 2011 financial year of 87%, down from 91% the year before. That means 87% of the money taken in for premiums was paid out in claims last year, and 91% the year before! There's less than a 15% margin on the insurance premiums themselves.
It's also important to note that Admiral are by far one of the best performing insurers, in 2010, the UK averaged combined ratio was 119% - yep. Insurers were LOSING money on the premiums they took in. The year before it was even greater. Of course this is mitigated and often reversed by the fact that insurers invest the money you put into them, but it does put to rest that they are ripping you off on the cost of your premium.
This also sort of suggests that maybe, just perhaps, insurers know what they are doing when they are setting premiums, however illogical it may seem to the consumer at times.
Like I said, if you think there is a better way of judging insurance premiums, go propose it to someone and get backing; if there's money to be made by the way you want to do it, you'll make an awful lot of it.
(source: Admiral Group 2011 FY reports)