Cost-Effectiveness and Retention are Big Factors
New research suggests that email marketing in the US will reach $2 billion by 2014. This isn’t exactly in line with research from JupiterRearch earlier this year, which suggested $2.1 billion in 2012, but it’s looking good for the industry nonetheless.
http://www.webpronews.com/topnews/2009/06/15/email-marketing-is-going-to-keep-growing