Not getting the traffic you expected? There are several things that factor into your success with Google Shopping:

• Number of items - Stores with larger inventories usually perform better, as well as stores that offer a limited number of high-demand products not offered by other online merchants.
• Budget - Set a budget high enough to compete with other merchants advertising the same or similar products and get your products visible to consumers. Now that many more online stores are using Google Shopping, anyone with an advertising budget less than $500 per month does not normally perform well. Your budget should be high enough to compete with all the other businesses that are also advertising similar products to yours.
• Marketing appeal - Create appealing product images and descriptions to maximize click-through rates. Make sure your product image quality, product names/titles and descriptions are updated to meet Google's editorial quality and image guidelines.
• Store website SEO ranking - Stores with poor overall Google SEO ranked websites will have their ad bids passed over or ignored by Google. It is advised you work with a professional copy writer to assist in unique product and category content. See our Developer Network for SEO improvement services, customer conversion features and other ecommerce tools to help you grow your business.
• Store ease of use - Google tracks past visitor navigation of your landing pages and website in general, and assigns a quality rank to your website. The higher your ranking, the greater the chance your products are advertised, the better your placement, and the cheaper your ad clicks will cost. Make sure your website adheres to the Google Shopping editorial and Google Webmaster editorial guidelines.
• Ad quality - Make sure that your product information used to generate the ads adhere to Google's Shopping policies.