The reason some action figures, comics, toys, etc are worth a lot of money is because there are a lot of people collecting them and very few of them out there. The reason so few of them are available is because no one knew anything about collecting back then. No one thought to save toys or keep them in the original packaging.
Now days, everyone knows that keeping toys in the packaging might be worth something to someone in the future so tons of people do it. There will be a handful of collectors and thousands of people trying to sell what they are collecting. Therefore, none of it is worth anything