A group of researchers from RainToday.com explored the question: Is it worth the blood, sweat and tears required to write a business book?

They found that ultimately while writing a book is a long and strenuous process, if you have something worthwhile to say, it can have a tremendous positive impact on your business across the boardespecially if the marketing process is approached correctly.

The difference marketing can make is fairly significant. When authors hired a marketing/PR service, “the median number earned $55,000 in direct revenue from book sales, compared to the $25,000 earned by those who did not”.

Read more stats here.