Here's how. Make the item scarce in a most areas, ideally where a lot of collectors reside (group A). Make that same item available where there are ample number of collectors who are willing to resell (group B). Create some good publicity about the item via blogs or video reviews to pique everybody's interest. Group B will hoard the items thinking that they can make a profit from group A. And the manufacturer wins because their item will sell out to group B whether or not group B will be successful in reselling them.
Magneto (center) with son Quicksilver(L) and daughter Scarlet Witch (R)
Unlike Mattel, Hasbro didn't have to resort to labeling/branding something as "collectible", "limited edition" or "for the adult collector" because branding means additional cost without adding value to the product. They are making their products sell faster (because selling slow makes the seller lose money) just by distributing cunningly. Don't you just love marketing strategies? I'm learning a lot each day.