MOB, what happens of you keep running on those lobes? Does the whole lobe disintegrate? And does the type of motor oil have anything to do with it?
Lobe wear stabilizes at that point, that wear was from poor metalurgy in the forging process... but at that point it becomes stable..
BUT, the cam surface does accelerate the wear on the follower's surfaces, the followers are also a forged metal, with a "hard" surface coat, and a chrome "hard plating", which when it begins to wear, will continue, and eventually wear a "groove" in the fash, and 'dish' out and continue to, until some point it creates adjustment issues, and then further wear of the remaining cam's 'crater edges'...
check the followers, if they are worn, replace if you are replacing that cam.. if not replacing the cam, run them as long as they work...
also I'll give you a tip... the followers are the same part on the 500 Ninja engines of the same era, just they had only 2 sets... I have a couple as backups, and also in case I have an adjuster screw/nut strip.