Didn't detect even a hint of sarcasm in my prior post?
Feel free to enlighten me about Perth Mint's procedures, then..
It's my understanding that they purchase all kinds of old stuff from various sources, in a wide range of quantities, per their website.
Items that are way too beat-up & unacceptable to pass off intact elsewhere go where, again? In fact, I've heard they don't pick through as much as they used to, and have melted down some real beauties. And PM is far from the only one guilty of that.
Now about to melt down some old bars. Were they XRF-tested? Ultrasonic? Perth Mint bars are thick -- and only one true way to find out what's in the middle.
And if they're going to put their name & purity on new pieces created from this old material, then yeah, you better believe they're going thru the refining process before they stamp that 999(9) again..
Anyway, bottom line is, there are plenty of unknowns out there about older pieces. Things were not permanently recorded, and each individual item cannot possibly be tracked over the years/decades/centuries. There are even quite a few examples of common government-issued currency from former global super-powers which did not keep records of mintages, or at least of which are no longer available.
So how is one supposed to know not only how many pieces (whether bars or coins) were originally created, but also exactly how many are surviving today, and in what condition?
[As an aside: Yes, some owners abuse their PM possessions, whether knowingly or unknowingly, sometimes right out of the package -- see it happen all the time on popular YouTube channels, for example. Makes me cringe.]
So, those who have the interest & desire gather whatever info & observations they can get, and can only reasonably estimate based on what they do know, which is obviously subject to change, in hopes of determining fairly accurate mintages & ballpark survival rates.
And yes, there's a variety of collectors out there, with a wide range of budgets -- some of whom will pay up for certain pieces. That's their prerogative, their money. I think some are nuts, and have even stated so earlier in this thread. But at the same time, can still respect their decisions, as I understand where they're coming from, so to speak.
As for any potential pumping & dumping? Goes on in every industry; PM's are no exception. But also keep in mind that some people out there have different passions than others, and also to varying degrees. What might look like pumping to one, might actually only be extreme enthusiasm -- or vice versa.