I think a more important thing to consider is the huge price difference between the Kindle version and paperback. With the Kindle version so much cheaper there

I think a more important thing to consider is the huge price difference between the Kindle version and paperback. With the Kindle version so much cheaper there is no way I'd even consider the paperback. I think he'd do better overall if the Kindle version was $7-9 and the paperback was $12-15. (I have no data to back this up whatsoever). He'd be making more from the kindle version as you suggest but might also get more people who are willing to pay an extra few $ for the physical copy.