As a teacher, nothing makes me sadder than to see people not complete. It feels like I failed to keep them engaged. I taught a free software development course online for three summers in a row. Completion was awful.
To be blunt, I won't waste my time preparing videos, material, assessments, etc anymore because it feels like nobody cares.
Don't be dejected! If your materials are good, people will continue learning from them, regardless of whether or not they finished the course. One of the major advantages of digital courseware is that you can take it on your own time at your own pace. Doing so is not an indication of not caring.
How were the raw numbers (versus percentages). On the absurd side, if 99.9% of a class of a million drop out, you're still reaching more people than a lecture hall of 100 where only a few drop out.
To be blunt, I won't waste my time preparing videos, material, assessments, etc anymore because it feels like nobody cares.