These would seem to be more common, as when the die experiences this, note on the image above, the die was retired. So if they notice these, they probably are retired soon there after. This is a die event that affects the area of the die that can not be polished off. They only die polish the face of the die. If they altered this outside area of the die and they tried to use it again, then where the polishing was done, it would be too small for the collar. Thus allowing the rim to be altered. So thinking about this makes me think they die would be pulled/retired early. Thus the two images on the bottom of the image shows retirement for a die.

So the collar clashes are probably about the same number as
Cuds. (Another die lie ending experience) Prices won't be the same though as a
Cud is more in demand.