I have a suggestion for you to consider.
Adding a way that users can indentify coins they don't own, but would like to own. Perhaps a "check box" on the coin page. Then, a way to view and print your "wish list". I suppose it could also be integrated into the swap section, as well.
Just a thought. I browse the coin by country sections all the time, and I see coins on here that I search for on ebay, and it would nice to be able to keep better track.
Thanks.