Flat rate priority mail triangular boxes for cues are still around $12- $15 without extra insurance USPS. In 20 years of shipping that way- maybe 100 or more times for cue sales and repairs- I never bought the extra insurance- maybe I was just lucky- but I view the insurance as a big flag to potential PO thieves- they would now KNOW something valuable is in the package- and also figure ( if they even care), well the guy will get his money back anyhow if I steal it.
I would be willing to bet , I am sure there are PO stats- that MOST major PO thefts of packages are insured items sent first class or priority mail. You do NOT get any extra care from the PO for insurance, just your package saying "here I am- money in the bank for the criminal"- and I understand from others- a royal hassle to collect from the PO if it is stolen or damaged.
One time, I did receive a UPS- not USPS item - cue case that was damaged - box crushed- UPS would not pay! I had to directly contact UPS Corporate office - Atlanta- EVP Customer Service- to get satisfaction.