Should have known when I replied to a life time member for Ping/////
I don't know if anyone had worn out the grooves entirely except for some old forged irons used by the likes of Snead. He probably used up one set of irons per season.
Ping Eye2 is legendary of the heat treatment they used for longevity. I meant lost of the sharpness to spin a golf ball like when they were new. By no means wearing the face down to smooth.
I know back in the 80's many Tour players had their Eye2 irons re-grooved each season by OEM.