Originally Posted by JSWolf
You can get ePub's out of B&N's ecosystem the same way you get them out of the Adept ecosystem. Those that can liberate B&N's ePub can also liberate ePub with Adept. Those that cannot liberate B&N are also those that cannot liberate Adept ePub.
When you remove the DRM from B&N's (reflowable) ePub or Adept ePub, you get box standard ePub.
So count B&N's sales as standard epubs. Even then the combined sales of standard epub books don't necessarily outpace Amazon's. You have no sales figures that show that, and it seems very unlikely.