While this does happen once in a while it's not as common as you make it out to be. I resold Chewbacca masks[1] during that hype for an obscene markup and everything I sold was a real transaction. I sent the masks, got paid, everyone was happy. But really, people paid and they sold fast, within the hour.

https://en.wikipedia.org/wiki/Chewbacca_Mask_Lady