Does Email Marketing Give Sufficient Returns

If the trend on companies spending more and more on Email marketing is to be studied, the return-on-investment on such campaign looks encouraging.

Marketers willing to spend the same budget on Email marketing as last year : 25 percent
Marketers increasing spending by a few percent : 22 percent
Marketers increasing budget by 1.5 times : 10 percent
Marketers doubling the budget : 7 percent
Marketers more than doubling the budget : 10 percent
Marketers spending less than the budget on last year : 4 percent