Here is Dan's note:
Which direct marketing channel delivers the best return on investment? Your own experience guides your strategy, but the Direct Marketing Association (DMA) has done some broader research for the years 2004-2010:
In 2010
For every dollar spent on the average ROI was And the historical 6 year trend is
Direct Mail $15.28 on the rise
Telemarketing $8.42 in decline
Internet $19.86 in decline
Email $42.08 in decline
Newspaper $21.26 in decline
DR TV $6.62 in decline
Magazines $10.26 in decline
Radio $8.28 in decline
Insert Media $11.43 in decline
The answer to the question is simple, but marketing is not a simple science. Mixing media has proven to be the best strategy to insure optimal penetration and reach. Direct Mail plays well with all other media. Consider making part of your mix if it isn't already.