2013-05-25, No hiding place, In America alone, people spent $170 billion on “direct marketingâ€â€”junk mail of both the physical and electronic varieties—last year. Yet of those who received unsolicited adverts through the post, only 3% bought anything as a result. If the bumf arrived electronically, the take-up rate was 0.1%. And for online adverts the “conversion†into sales was a minuscule 0.01%.