Businesses engage in email marketing because it works. And works well. Here's the proof...

According to research conducted by the Direct Marketing Association, email marketing generated an ROI of $51.58 for every dollar spent on it in 2006. The expected figure for 2007 is $48.56, and the prediction for 2008 is $45.65. As such, it outperforms all the other direct marketing channels.
A July, 2007 survey of over 3,000 marketers by MarketingSherpa saw "email marketing to a house list" garner the most votes as the strongest marketing tactic. And it gained more votes than any other tactic for "good ROI." (ROI = Return on investment)
Research conducted by Shop.org in 2007 revealed email generates sales at an average cost per order of under $7, comparing favorably to $71.89 (banner ads), $26.75 (paid search) and $17.47 (affiliate programs)
40 percent of email subscribers will go "out of their way" to patronize a company whose email programs they like - Quris (2006)
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