Quoted from zacaj:Most of what you say there is sound, until you get to "Pinballs from this era dwindle by approximately 30-60% every decade. ". That feels like a completely arbitrary estimate? I don't see any reason why that would be the case
I have studied hundreds of games from the era. 30-60% holds true. It happens for a variety of reasons, however, as was mentioned previously.
There is a post below the one I made that pulls info on 30 year old pins that states only 5-10% remain...you will find that is right in line with the 30-60% declination per decade.
Nothing is finite, and (as I mentioned) there is no way to 100% "prove" the numbers, but those estimates hold for pins of that era.
You may "feel" that it is arbitrary, but I would implore you to go study production numbers, sales ads, owners, wanted ads, auctions, repair questions, reproduction playfield and backglass info, sold listings, repro ramp/target info, repair guides, etc for a minimum of 300 pins across various websites, social media forums, databases, and auction sites and then get back to me with your findings.