If the cost to an individual insurance company is low enough (in the few millions) and they're not really at risk of it suddenly exploding, and the cost for them to mitigate is also in the millions (or risks killing a customer), they're unlikely to improve. Fight Club, but the other way around.

However, if they all gang up together they might do something - but that can cause other issues (a local insurer becomes the only insurance available, etc).