How often do you expect to replace keys?

I bought a Ducky 3 Nazca Lines a year or so ago, and it's the nicest keyboard I've ever owned.

It's also the most expensive, and first to have two of my keys break (I had a crappy logitech before that lasted 10+ years before something like this). It looks like the bottom casing where it met the switch failed on my numpad 2 and 5. Luckily I have an entire extra replacement set so it was a 30 second problem for me.

To be clear, this is a great keyboard and this is more my fault as I've been a little rougher than I want to be with this one since I had to travel with it relatively often.

How common is it or often do you expect to have to replace or repair certain parts on your keyboards?