It's a legal way of lining pockets which both parties have allowed. Organizations like the DNC, Planned Parenthood, the Teacher's Union, etc., buy blocks of these books in an attempt to get it on the best seller's list and payoff a candidate who inevitably will be able to do things for them. Follow the money. Always follow the money. Some Republicans aren't immune to this practice.
Obama's first book was published by Time's Books. That's right, a New York Time's company. They wouldn't share their sales records so people could see if Obama's first book's success was due to individual sales or block purchasing. But they did put him on The New York Times Best Seller List. Now why in the world would anyone want to read about Obama? He was a nobody at the time except for in his own narcissist's mind. It's hard enough getting people to read, they're not going to spend their time reading about a new Senator, from Illinois, who had done absolutely nothing.
We're living in a world where people don't care about the truth. Where they manufacturer stories for their narrative. Where they proactively pursue burying stories which don't support their ideology. Where truth is like gold, and not easily found. Who am I really talking about? We all know, the Left. They are so corrupt and it's time to end their game.