The audience here is comprised on visionairies and tech for the most part. Once it becomes mainstream, many more topics and posts will benefit.
I see it as a way to learn the platform and planting a tree from a seed for the future. If you don't think it will become mainstream, then it probably is a waste of time, but I don't think that is correct.
So... the content that you are planting here can be used in the future as well to establish your credibility. Small steps. Not get rich quick.
Besides, it looks like this one is working for you. :)