I don't care about Mooc completion rate at all. If for example only a few hundred people completed the course, this means that the course had brought educationa

I don't care about Mooc completion rate at all. If for example only a few hundred people completed the course, this means that the course had brought educational value to thousands. For some professors the kickback value might play a bigger role. Some courses on coursera are just not taught as widely as the professors would like to have it. For example Hinton's Neural Network course, or the one about Quantum Computation. In these cases, a few hundred completers would be plenty to justify the effort of the authors (in my opinion at least).