[Continued].........
If a dealer knows that the stamp is rare or [even worse] very rare, then he or she must know roughly how many exist. But if it is an EFO [I will use the term EFO from now on, although we must yet determine which is which], how can he or she know ??? Unless they have some 'inside' information.

Let us go to one of the USPS printing companies [or any other Postal service if not USA].
A situation, one of many I could make up [if you want more I will be happy to oblige].
The Night shift.
The Assistant manager notices a few sheets with perfs missing on part of them. He ghosts the sheets away and phones Dealer 'X'. The dealer is willing to pay $X but wants the part sheet intact. But the Assistant Manager cannot do that because a new security shift has started and he can only take the sheet out in pairs which he will cut with a guillotine. The price comes down a bit. It is easy to take small items out but not sheets.
He then orders the a new perforation plate to replace the old one and the next print run goes ahead.
I know it is not that simple but I also know that security is paramount and checks are made before during and after.
I could make up a hundred other stories like that one, all different but I am certain, all with an element of truth.
Those who believe that all those errors from the
ebay list [150 pages!] and all those millions of other EFO's worldwide are simply mistakes [see above explanation], are living in cloud-cuckoo land.
I, for one, do not believe that sheets of EFO's are missed by the checkers, missed during cutting, missed during packing, more checking, missed by the Post Offices and only noticed all over the country when a 'lucky' customer takes it in to a dealer who gives him a lousy price before making a good profit. I don't think this sounds too far fetched do you ?
There are so many EFO's on the market, EFO's that should have been destroyed at source, that it is just too unbelievable they are just mistakes. The printers, the checkers, the cutters, the security...all mistakes ?

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Londonbus1.....Doesn't collect errors...but has some !
