I used to have a coin company. Shipping coins requires a very high percentage of success or you lose your a$$. I never had a domestic shipment lost. I never bought insurance. With a small package, a high insurance value can just say "steal me".
With coins and with stereo equipment, your best insurance is tape and padding. Package correctly, ensure the outer container is impervious (with various types of tape), and use a barcoded label covered in clear tape and it will be very unusual for a package not to arrive undamaged.
Buying insurance does not change how a package is handled. If you think buying insurance relieves you from packaging correctly, then you are just choosing to sell your component to the insurance company after a long red-tape battle to collect.
Jerry