Fun book "facts"

Some undated, unsourced book facts from a blog not known to me:
-Book review column inches in newspapers have dropped by 20 to 50 percent.

- Women buy 68 percent of all books sold.

- Most readers do not get past page 18 in a book they have purchased.

- 52 percent of all books are not sold in bookstores!

- The industry return rate [from bookstores] is typically 36 percent for hardcovers and 25 percent for softcovers.

- It takes an average of 475 hours to write a novel.

- Fiction is considered successful if it sells 5,000 copies.

- Writing a nonfiction book requires about 725 hours.

- A nonfiction book is deemed successful when it reaches 7,500 copies sold.