Considering most eBooks with the free first book are like $0.99-$3 a book after you take out Amazons normal profit cut for the book they probably aren't really

Considering most eBooks with the free first book are like $0.99-$3 a book after you take out Amazons normal profit cut for the book they probably aren't really paying that much for the free book anyway so it makes it worth their while to do it this way.