What you don't seem to understand is that some of the pictures I posted were basically... all the current available stock for those games. When the seller that found the Dr Marios started selling them, no one in korea had a copy of the game.
Except that outside of the few games for which dead stock have been found in the early 2000s (the NES games I posted, contra hardcops and battlemania 2 for the megadrive, diddy kong racing for the n64, yoshi's island for the snes) everything else is just a no no since I've been looking for them in... 2004 to do this:
https://www.guardiana.net/MDG-Database/Search/?search_value=&search_field=T&take_items[]=0&take_items[]=2&take_items[]=1&take_items[]=3&take_items2=0&platform=MD®ion=7&year=&players2=&cover=
There is a LOT of stuff that are a "less than 5 known copies in CIB condition".
And we are not talking about obscure bizarre stuff, we are talking about retail stuff. Which is completely insane.
My understanding from all the talk with korean collectors is basically that almost everything ended in the trash bin at one point in the 90s AND that many people there were buying Xin1 cartridges because they were so widely available and such a cheaper way to play AND many people would go for the japanese version that were objectively infinitely superior quality (you really need to get a korean megadrive game in your hands to understand what I'm talking about there)