Cam regrind?

How did a roller cam get worn like that?

...and new roller cams are considerably more than 50 bucks, Hundreds more.

I bought a used one from a FxBO member for $200 and was super happy.

At the time that was darn near half price.

The cams themselves are not that much more if you consider what I said. If you can get a cam for less the $50, go get a regrind. If you can't find one for less than that, and have to pay for shipping for the cam, and then TO and FROM the cam grinder, the costs associated a regind fade especially since the regrind costs is around $200, at least from OCG. So, you can get a new cam for $400(ish) or pay a high price for a core, then shipping, then time.... get the picture?