You don't. But insurance companies will hire a $50,000 arson investigator to save a $150,000 homeowner's claim. My stepfather was in the insurance business and explained to me that he has seen too many people become homeless with no money just for things people take for granted or don't worry about.
I sleep well at night. And I have been known to pay a licensed electrician $150 to look into my circuit breaker box and close it up; and I keep that receipt in the fire proof safe. I want that insurance check.
I don't want to become homeless and I don't want anyone on this Forum to become homeless. So, Ground your equipment and don't let 50 year-old failure-prone components fester.