Good quality spark plug wires will last 10+ years. The toad has perfectly good TWENTY TWO YEAR OLD spark plug wires. Sealed ball bearings on the distributor shaft would last 20 years. You are trying to compare high amperage points and condenser aux component life with stuff that uses 1/100 the current. My IRON ELECTRODE spark plugs lasted 90,000 miles. HEI distributor caps lasted 6+ years and they weren't even high alkyd plastic. I cannot believe anyone in their right mind would justify four hours to change spark plugs. Like ever increasing computer hard and software obsolescence this stuff is carefully designed to line people's pockets.