My clutch cable made it to 16000 miles going strong. I lubed it when I got it. I think Jack's unlubed one made it to about 12,000. These are both UCEs which have a lot better routing and mechanicals, and should last a lot longer. They still require a little maintenance which doesn't include WD40. Do not confuse WD40 with good cable lubricants. I use Dri-Slide. there are others out there, WD40 isn't on the list...for any lube job.
Bare