Corvette owners are known to change parts way before they have to.
One is the sparkplugs.

A new set can cost $20-$30 plus the hassle of going to a store to buy them

Using a cheap $20 tool and you can reclaim all those used sparkplugs you have just lying around or cleaning the ones that are in the engine now.

Here you can see the difference when the plugs are dirty and then after cleaning them with a tool that uses sand and two types of tools made.
One uses an air compressor and they also make a type that plugs into the car battery.

With a little time you can clean a whole mess of them and recover $100 or more in parts you thought were junk.

After sandblasting, clean them off and the re-gap them.