my feedback is that if you want to target a high-end market you need a high-end website of your own.

The design of the current site + cart solution doesn't reflect the elegance I assume your main clientele would be accustomed to.

I'm a huge fan of Shopify for simple, pretty online stores.. you might want to check it out.. many of their free themes would be an improvement over the current design.

GOOD LUCK!