It's like nobody has ever heard of a supply/demand curve.
Agreed.
My first thought: "Are people are buying public domain philosophy works as Kindle books?" http://en.wikipedia.org/wiki/John_Locke
My second thought: "Is somebody writing as Locke as a reference to Ender's Game?"
If there's an "if" in every one of your hypothetical sentences, it's probably not an argument worth pursuing.
According to the article, he recieves $0.35 from a Kindle sale, and ~$2 from a traditional book sale. In this case, he would need to sell (2/0.35) = 5.7 times as many Kindle books as traditional books to be neutral between the options. To get the equivalent incentive from traditional books, he would need to sell ~175,000 traditional books.
Since he offers both physical and Kindle editions for his books, the question becomes, did ~175,000 customers purchase the Kindle book who normally would have purchased the physical book? Probably not, IMO.
So basically, it sounds like Locke actually knows what he's doing - he's driven by monetary incentives and his arrangement has more-or-less maximized his proceeds.