@OldGoldGuy The other side of the debate would be that you would want to buy from a dealer that doesn't know what they are selling. Some contemporary counterfeits can be more valuable than the original thing. Not so much true for British sovereigns, but take coins like 18th and 19th century Spanish and Latin-American coins. They may test positive for precious metals, though more detailed tests would reveal a significantly lower purity than it should be. You said it is your responsibility as the buyer to know what you are buying, that is true. But if you are familiar with the coins you buy, this can be more of an advantage than anything else. Lots of dealers get fooled by contemporary counterfeits, and that is a great area to make a good haul. That being said, it may very well be true that the seller here knew the coins were not genuine sovereigns. But, they were genuine gold, and he sold them as gold for the price of gold. No one got ripped off. Maybe the buyer thought they were getting a really good deal, but instead got a fair one. It really goes both ways.
Again, and for the final time, my posts focus on competency and not malicious intent. And if the buyer was the recipient of such a good deal, why did he create this thread, want a refund, express his concern, etc? I feel that if the scope of my posts are being misunderstood, then at this point, the horse is dead and does not require anymore beatings.