What would cause my clutch oil to be low?

Fountainhead

I wonder how often the bearings go out, vs. the seal? I know that most folks here have the seal go out, but have any long-time forum members seen the bearing on the CSC go out?
Any bearing assembly has a limited lifetime of rotations designed in, so that's why I commented on keeping my revs low. I don't know how many that is, but since mines been rotating since 2009 must be a lot.
I do my best to push the car out of gear smoothly (without clutch) at red lights and stop signs so as to lessen the number of cycles I put the CSC and CMC through. I also do the ranger protocol often.

Note: I test drove a 2015 Carrera 4S manual the other day and Porsche design won't allow the stick shift to be "bumped" out of gear, the clutch must be fully depressed. Just something I noticed driving it.
Also didn't notice a great deal of difference between my Z and the Porsche other than the oh-so-nice interior.