The distinction between openness in practice and openness in content is significant in cost as well. Creating content requires time, effort, and resources and opens up numerous discussions around intellectual property rights. However, openness in practice requires little additional investment, since it essentially concerns transparency of already planned course activities on the part of the educator.
I appreciate the distinction -- between openness in content and openness in practice. But may disagree on the assessment of their associated costs. I bet the authors' thought on this has also evolved after the MOOC movement.
In open science, both kinds of openness will incur burden and cost.