Yes all of this does make sense. We have been married 22 years and my husband had USAA before we got married so we have had our police a long time too. Plus we have the jewelry rider on ours too. So I guess it adds up when you have a lot insured like you and I do.
Plus, when you get your letter from USAA showing your balance, it explains what it is and that it is calculated. It's not hidden and it's not rocket science. I'm guessing people just throw out correspondence from them.