I've only replaced one wedge in my life due to wear. My original sand wedge was a cast cavity back and after 20 years of play the distance control on full swings was getting noticeably looser. Didn't have a wear spot on it, but I presumed that the grooves were not biting as much. When I replaced it with an SMT Durometer, the distance control came back, but the overall distance was quite a bit shorter even though both were the same length and marked (never actually measured the loft on either) as 56 degrees. Had to go buy a gap wedge to fill the gap. Ended up having to replace the Durometer because I left it on the course one day, not due to wear. 😥
I need to find an old wedge, polish up a shiny spot in the center with my dremel tool, and carry it around in my bag so everyone will know I'm a playa.