Giving your second pic. a closer look, I can see wear where the rocker arm runs against the lobe. The cause of this is lack of proper adjustment. People who don't get periodic tuneups and valve adjustments will see this problem. Back in the days when I worked for a dealer, we sold a lot of camshafts and rockerarms for this reason. If all of the lobes have this kind of wear, it would be a really good idea to have someone regrind the cam and the rocker arms. Rocker arms are just like lifters and should only be run on the cam lobe they were broke in on, as they develop wear paterns like flat tappets do, changing positions will cause accelerated wear.