Damn. What are you doing? Pretending your fingers are jackhammers?
Three big things. One, 20+ years on buckling spring or other >70cN switches. And I bottom those out, so you can imagine what I can do to anything <60cN. Two, I type. A lot. Over 450 keystrokes per minute, 12-16 hours per day, on the same keyboard. So more than 90% of it is actually just normal wear and tear - compressed into a very short timeframe. Three, ABS keys just aren't nearly as sturdy as PBT, and I need that sturdiness.
I mean honestly, it's not just ABS that gets worn out. IBM PBTs also wear out, but they take a lot, lot longer - usually 1 to 3 years depending on batch and type versus 2 to 3
months to give you an idea of how tough dye-sub PBT can be made. (Remember that I'm impacting these keys with a lot of force and I also rest both hands on the keyboard so there's gradual friction wear as well.) And $30-50 every 2 years to extend the life of a working frame is a lot more tolerable than having a ton of essentially useless keyboards laying around just because the keycaps are toast.