I've noticed that too, I was after the Diecast ESB boxed Falcon with damaged blister but it went far too high.
About a week later it was on ebay and sold for a bit less, still too high IMO though. Buyer said he was selling it because something else had come up for sale he wanted more.
Trouble is, by the time you add that 24% fee on top, plus postage if needed, Vectis items are just too expensive to sell on for a profit. If they're for you collection, that's ok, you pay what it's worth to you and enjoy the item.
You're playing with fire if you're in those auctions to make money out of them.