Do you sell on third-party sites as well as your own? If so, those third-party sites likely have their own search engines. It is important that your product names and descriptions be optimized for those search engines. Otherwise, on site visitors will find your competitors’ products before they find yours.
SEO makes a difference for every site on the web. It can make an enormous difference in the e-commerce arena, where the competition is especially fierce. If you are still on the fence about eCommerce SEO, remember this one thing: people cannot buy from you if they cannot find your site.