For me the only investments are stocks. Pinball is a toy. I'm in the camp of owners who would be happy to see more POTC produced because then it would mean the possibility of game specific spare parts becoming available if ever needed. I think there are a lot of owners in the forums who have expressed that same thought. People who recently bought games at sky high prices might think differently.
But I'd guess a very large majority of current owners purchased at a price lower than what JJP would likely sell a new version for (if that unlikely event happened) and so really wouldn't be concerned about any impact to resale. And anyone concerned about locking in a value probably would have sold it by now anyway.