I believe that what's going on here is arbitrage. I while ago I found a Seiko 6138 Kakume on Yahoo Japan. Noticing that the same watch, same photos, was listed on eBay US with a somewhat higher buy it now price, I submitted an offer to the eBay seller saying that I would be willing to buy from them and avoid Buyee's fees (the bidding intermediary for Yahoo Japan) if they came closer on the price, with no reply. I ended up buying the watch from YJ via Buyee and later realized the eBay seller doesn't actually have the watch: they just copy listings from Japan to US eBay with a mark-up and only buy the watch on YJ if it sells on eBay. Actually a service for buyers who don't know about YJ or how to shop there.
I'm guessing your multiple listings may be something like this, just with more players.
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