I don't know. I think I've seen the coral one you mentioned too. I can't help wonder if maybe they are possibly setting up a listing and bidding on it themselves, or a friend with a different account, to try to create the façade of being a reputable seller of ridiculously high cost items. Maybe I'm just paranoid lol but like you said it is unfathomable to imagine it all as legitimate.

...I mean if that bead is worth over $700.00 I have one that's near 2x it's size AND carved to I think it's a melon style shape that ought to bring in at least a few grand! LMAO! :P