The Skareb Super uses a fully sealed damper, which means that the damping oil and the stanchion lubricating oil are prevented from interacting. The oil which lubricates your stanchions (and as mattsavage posted, could be Prep M grease, if your fork has grease ports in the back of the stanchions) is exposed to dirt and debree which gets inside past the seals. The oil inside of the damper is not.
In my original post, I referred to the oil in the damper. Since it doesn't come in contact with the outside, it stays very clean and can be run for a long time before needing replacement. The oil which lubricates the stanchions, on the other hand, does get dirty, however, its only function is lubricating the contact between the stanchions and the lowers, therefore if it is dirty, it can remain dirty for quite some time before you should replace it. If you have grease ports, then you continualy inject Prep M every few rides, or whenever the interface feels dry.
This is contrary to Marzocchi and Fox, as well as Manitou's new Intrinsic damped forks. In those forks, oil used for damping is also used for lubricating the stanchions. It does come in contact with dirt and debree, therefore it needs to be changed regularly. This is particuarly the case with Marzocchi as the dampers themselves produce a lot of metallic debree.
Why you shouldn't bother? That's because it is a very messy procedure, especially if you haven't done it before, to disassemble the fork and replace all of the fluids. And Manitou's way of separating the damping oil from lubricating medium is very effective in keeping the maintenance to the minimum. If you want to do it, still, then by all means go for it, as it is very educational.
_MK