Clive Cussler has 37 books with less than 150 million in advertising.
Another great book is Black Beauty, by Anna Sewell. Adults' customised products, possibly said, are popular because they boost the ego. Most responsible thing you can do as an author is saturate your mind with good writing. http://A1pay06.com/bbs/board.php?bo_table=free&wr_id=2609852