I've had a KS Lev for over a year. Maybe 150 rides on it and I haven't changed the cable. A few things I've learned: the way the cable attaches at the post end is tricky to get just right and the overall system is sensitive to housing length. I've had two minor cable adjustments since I've had it (once at Obsession and the other time by Fraser when he worked at Corsa) but I've never had a major rebuild. I've never even considered the possibility that cable actuation was a bad thing. I like that the lever is super minimal and replaces a lock-on collar. It's been really good.
Good to know. I just think that with cables, grit and muck get in. But it's not hard for me to remove the cable, lube it up and put it through the housing again I guess. Or to put stanchion lube on the post. But I'd rather not have to do it on a regular basis. I think I might put the under the seat lever back on the hilo and use it that way until I upgrade to a better remote post.