The only thing I can see as to why someone might not be completing a sale is the price. I understand that your products are of very high quality and that they take a long time to make. But I cannot imagine paying $30 for a single luggage tag, plus $9 for shipping.
Also in the description you give shipping time and info. Why would it take 3-5 business days to ship out something you have in stock? That, for me, would be a deal breaker. If you have it in stock, it should be out that day or the next.
Other than that, your pictures look great and very well made.
Obviously you have been at this much longer than I with great success, so you can take or leave what I have to say :)