Insurance is pre-paid, so it has little to do with who will pay and who wont. if you dont pay you are dropped.
It has more to do with a correlation wrt to claims likely to be filed.
Personally, while I understand it, I think it sucks. I worked in insurance at one time and always hated having to explain to someone that had never filed a claim, had an accident etc., why their rates suddenly jumped.
Contrary to what some people think it isnt just raw credit score, it is a variety of factors that go into calculating an insurance score, including, for instance, hard pulls, so someone that is buying or refinancing a house and has otherwise stellar credit gets dinged. someone who marries someone with not perfect credit or something major, such as a bankruptcy or foreclosure would often really get hammered, etc.
It is also true that all insurance companies do not apply all of this equally, or on a straight scale, in other words I saw many examples of companies cherry picking prosspective customers based an these scores and giving "**** you" pricing to others, effectively pushing them out the door.
Unfortunately, that's the system until they find something else to try to predict and underwrite risk....