I dislike throwing away repairable things. Like this old, very cheap but quite good knife (originally from Ikea): after more than a decade of daily use and the associated dunkings, the wooden handle had finally rotted away and split.
So I made a new grip: reused some wood reclaimed from a door frame, shaped it with my router, glued-and-screwed the grip halves on, sanded and lacquered the thing multiple times.
Why? Because I can, because it is fun to (re)make things and because a well-made thing gives me satisfaction.