Why are the BiggerPockets books not available on Kindle?

[Nicholas B.]

After spending much time on the Blogs and Forum, I decided that I'd like to purchase the BP books. I was shocked that they're not available in Kindle version. 

I understand that there is a PDF version available, but Kindle is my preferred platform for organizing and consolidating my reading material. There are even 2 free BP "guides" on Kindle, but unfortunately, not the books that I'd like to purchase.

Is this something that's likely to change in the future?