Wouldn't people like to buy a book about the lives of Haerta, Ganonron and Jephton?

[Thattaman]

A whole book dedicated to three guys who had just slightly more screen time than Yik Yik doesn't scream appeal.

Actually, if look at the character appearances thread, you'l see that Jephton and Ganonron are actually higher on the list than Yikyik.