I think that was who it was. The listing has now gone. I can understand dealers buying and reselling at a profit, but collectors are quite savvy, so if there is a coin of interest come up at auction, the likelihood is that the collector will be bidding on it.
A while ago, Jon Blyth listed a hammered coin on ebay (think it was a William I penny) which sold for something like £2500. A week later, the buyer relisted it for around £4500. Again, those interested would have been bidding the first time around...I would have thought.