Regarding a homeowners discount for homeowners, that really is a loss ratio thing. If you can be responsible enough to manage to own a home, then that responsibility generally translates into driving slightly more responsibly, or at least having fewer claims dollars paid out.

You CAN get the credit just as equally, though, with a RENTERS policy as with a homeowners policy. Usually, that credit is a percentage of the premium.

Insurance companies don't worry about how, or why, there are fewer claims with home ownership – just like they don't worry about how or why with credit scores, marital status, gender, etc. The how or why isn't relevant. All that's relevant, is that there is a direct corrolation between those items, and claims. The reasons behind it are irrelevant.