In other words, you can draw in people with your mobile content but it's harder to produce something meaty enough to get them to buy.
Or you could look at it another way; optimise your mobile site with content that is all about catching people's attention, rather than stuff that's designed to produce the sale.
So should be thinking about top fives, short snappy blogs or even just a few lines to make people click through to the main website.
Leave the white papers and in-depth features and case studies to your main website or even your social media campaigns.