Parts that just wear out

[Big G]

I've been racing my 2010 spec DEX410 for just over a year now so she's traveled a fair few miles and naturally things just wear out.

This isn't a complaint of any sorts and I have much praise for Mr Skelding and Mr Ambrose helping me out at a race when I needed to replace worn out parts.

My driveshafts and outdrive cups seem to wear the most.

I've replaced the front driveshafts twice.
6 diff outdrives
front centre shaft once and centre rear shaft twice.
rear driveshafts once also.
and recently chipped a tooth on a diff ring (Will replace with the posh ones)

Is this normal or common amongst other DEX410 drivers?