I support that view. The cost is low and there are no obvious warning signs. You are doing your homework with Rogers. There's not much more you can do. Once you have the coin in hand, maybe you can have an expert look at it. If they say it's good, move the seller up on your list of trusted dealers.
If he turns out to be a good guy, a direct contact with the seller may help and be profitable to both of you, since it avoids eBay costs and gives you access to the seller's stock.
Peter