The caps on my 63C also show little to no wear. I guess it helps that the PAC is non-functional. Makes me wonder if it's been broken for a long time or just owned by some genius who never needed to troubleshoot his own network. Makes me want to keep them pristine and not use them at all.
On the other hand, I'm using some white on black Cherry DS which were well worn when I got them a couple of years ago. A few of the home row keys are polished to a mirror like finish. It actually looks pretty cool. I can't wait for the rest of them to get shiny.