I'm really interested to know if they'd approve of physical coins.  If they ask me to stop selling them, I will politely comply.

I looked in their list of prohibited items.  One thing that's noteworthy is you're allowed to sell gift cards - up to a fairly small amount - but no "electronic delivery" gift cards.  And you're only allowed to have one listing at a time.  By delivering physical coins, I have definitely hopped over the fence, at least to the extent this rule applies.  I don't see a separate section for "virtual currency" so I assume it will probably be not much different than selling a gift card.  Besides, most people buy this coin as a collector's item, not as a way of acquiring virtual currency.

eBay certainly isn't the most economical way to sell.  Just to list 10 physical bitcoins at $83 (incl. shipping), I was charged just over $10 with eBay and PayPal fees combined.  If that person had bought them on my website, they would have paid 13.50 BTC (incl. shipping).  Keep in mind that this is a physical collectible coin, not just digital BTC, so a premium above the trading price is reasonable.  That's equivalent to about $65 at the current market rate.  I collect just under $73, but I am also exposed to a likely possibility that BTC goes up and I have to sell on eBay at a below-market rate.  So after eBay takes its cut, I am not much ahead.