Yes, email marketing is one of the most cost-effective ways to increase sales, especially in the B2B industry, where customers are more likely to check emails regularly. Instead of spending a lot of time in structuring a direct-to-customer campaign using offline communications techniques such as 1 vs 1 telesales ,You can communicate with more customers through highly personalized message at one time with a great ease when doing email marketing. It is one of the most cost-effective ways to increase website traffic and increase sales. Here is an article about how to create a sales conversion email http://emailmarketing.comm100.com/email-marketing-ebook/sales-conversion.aspx