My OEM cable is coming up to it's 28th birthday. The key to long cable life is make sure the routing is correct, lube the cable with a PTFE lube, fit a grease nipple to the clutch arm, grease the nipples at both ends, grease the wear points on the lever, and make sure the clutch lever is not worn and catching on the cable. The reason I declined the Venhill swap was they were half the price of an OEM cable, and I had at that point never replaced a OEM cable on my bike. However last year I did have to replace my 27 year old throttle cable.
Regards Martin.