Samson was opened last year, correct? But yes, even when Panic Restaurant was opened a decade ago I remember thinking man, wish that one stayed sealed for a collection.
Really the best you can hope for is a sealed game with a lot of wear that can get bought around the price of CIB. Then the owner opening it doesn't devalue it that much... unless again it is some type of very early game where sealed copies are extremely scarce period. Otherwise I agree, there is a ceiling of how much someone wants to throw away in value just to support this list.
It's come a long way though and kudos to everyone who has helped it get this far!