I spent some time on your site, put a few items in the cart, checked out the shipping cost, return policy, about us, bbb, verisign, all the stuff one would expect from a professional online retailer.. And it all looks good. I don't know what your site traffic is like, or your percentage of turnover, but if it's low I think it has to do with the items you're selling.
Fact is, people know these 'Made in China' tools are junk, barely able to perform the task for which they are designed. You're selling junk and people aren't interested. I see you put a lot of work into that site, and a you did fine job I might add. But you picked the wrong product.