I enjoy reading through, "how-to" threads just to see what people are doing to their bikes as well as to gain more general bike and mechanical knowledge. Often times it is completely unrelated to me, like "how to do valve adjustments on my 2012 Super Speedster" when I ride a completely different make and model bike. I don't have much to add to those other than a, "way to go" or "I enjoyed reading your post." Other times I am way out of my breadth of knoweldge and I'm more along for the ride looking for an opportunity to learn something.
I have asked myself the same question as you regarding a few bike vids I have on Youtube. Something like 8,000 views on one video and about 10 comments. In the end I don't really care. I'm just glad someone viewed my bike video and hopefully enjoyed it.