FWIW...
I wouldn't insure a used vacuum cleaner bag of dirt with State Farm, let alone anything I value. The agent I had wouldn't lift a finger to help when I had a major claim, other than allowing me to use his fax machine.
As I understand it, it's the AGENT who gets paid for selling you the insurance. And collects a percentage of each premium you pay. So why can't the AGENT be of help when you are in need???
Claims "adjusters" jobs seem to be like used car lot owners--valuing whatever you have at the absolute insulting minimum, and then offering you only a percentage of that. IMX they only "adjust" in favor of the company who pays their salary. And the company holds all the winning cards, and you don't have much leverage against them. IOW, if you make an insurance claim--after paying premiums and never costing the company a dime, for years--you're gonna get screwed.
Self-insuring might cost more to recover from a loss, but all in all, it'd be less humiliating, less nickel-and-dimeing, less irritating, than dealing with a large insurance firm. You'd just shrug, pay for new stuff, and move on. I already have a full-time job; I don't need another full-time employment fighting with a huge corporation, and justifying every darn penny, and supplying serial numbers and receipts for things I bought 30 years ago, etc, etc, ad nauseum.
If I sound bitter it's because I am. If I can steer any business, ever, away from State Farm I will.