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Rudy has some years advising about sitting on sealed product. Of course, he's nuts. And I guess some of this doings have to do with prices spiking. At least on sealed product realm. It would be amazing to have the chance to invest in something like that.

They are only in Collectors boxes (the most expensive). Hoarding a few would be wise.

Yes, the value of those is insane. Also masters set like Modern Masters and so. Those go up quite nicely after the hype of opening boxes fades away.