ND sites have good content, and they update.
So you join one site and as a member you get loaded down with a huge amount of content and many updates weekly across the sites.
So the trials allow them to get more sign-ups in the door. I would guess that the trial to converts are up around 35%. Better converts also = more webmaster traffic which brings more traffic to the exits.
Earning the most amount of money possible from trials is about volume, even more so on flat rate program. The % of profit is smaller but when you do 1000+ sign-ups a day, that $ amount is rather large.
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