Guaranteed sales I guess. Good for me anyway. The playfield on my Centaur is a CPR. It was already installed when I brought it but it must have been a third or something. Definitely better than a beat original but the inserts are milky and the finish isn't as nice as my other CPR playfield's so I'm in for one.
The buyer of the original playfield would most likely be aware of the fact the playfield would have been a Bronze (based on your description). This is one of the reasons we pushed for the different classifications. The problem always was that sellers can claim it is "CPR Product" - but not advise of the classification.
Centaur and Fathom will ALWAYS sell. I'd be surprised if Centaur would still be available at this stage.