Actuaries at insurance companies, any kind of insurance, are always working on finding predictors of risk. They take actual claim data and try and determine what is common about the claim, about the claimant, etc., In this case, they run statistical models against the data to determine if there is a relationship between income and claims being filed. These same models were probably used and discovered a correlation between;
miles driven and accidents
gender and accidents
age and accidents
age and gender and accidents, etc.
While insurance companies certainly have made mistakes (both deliberate and honest), common sense would dictate that they don't just develop rates that have no basis in claim history. If they did this, they'd have no way of knowing if they will make or lose money on a given line of insurance.
They have to be able to do this so they can estimate what their potential payout will be which, in turn, determines premiums. When outside regulatory bodies agencies decree that certain criteria can not be used (whether or not it's a valid or invalid predictor) then they are forced to search for something else. For example, if (maybe this has already happened), if a regulatory agency decrees that males and females must pay the same rates, then rates will rise. Why? They can not lower male rates to the female rates or they'll lose money. So, the only thing they can do is create a blended rate, which means females will end up paying more.
Note: None of the aforementioned explanation applies for those who believe that people in black helicopters and the Trilateral Commission set all rates and that insurance companies are the embodiment of all that is evil. There's no logic or proof that will convince them. /forums/images/graemlins/tongue.gif As Stevie Wonder said,
When you believe in things that you don’t understand,
Then you suffer,
Superstition ain’t the way.