What are the benefits or faults of writing a book to read turning the pages left to right opposed to right to left?

If you're writing by hand and a lefty, it's helpful to not smear your paint. If you're jsut doing that for funsies, there is none. Unless you're writing in some other non-english languages, cause that's the only way to read it.

The only potential benefit would be that, for the right kind of book, it would be a sales gimmick. The content would need to be "think outside the box" tips, ways to approach one's life, or career, or education, from an uncommon and unexpected direction which has measurable benefits.

But a regular book? It would enrage readers.

in most of the western world We read from left to right and write from left to right, so it make most sense that the next page to be read is on the left, other than that not much really, as a leftie id prefer it was the other way around

 iguess the fault being when quil users were done writing on the right hand page, turning it over before dry would cause bleeding onto the previos page

Benefits: None

Faults: It'll piss a lot of readers off.

There are no benefits to doing such a thing. 

Look up the word "fault" in the dictionary and familiarise yourself with the definition.