They heard about a video that went viral overnight and they mistakenly believe that such a thing is the norm. In part this is because the media runs headlines like "Band's new video gets 1 million views overnight". If they presented both sides of the story, they should post another headline that says "Hundreds of thousands of people posted videos yesterday; Most were seen by about 5 people."
Just as most bands don't start playing arenas by their third show, most bands don't have a large, devoted following online after just a month. Whether you regularly want to pack the comments section of your posts or pack the seats at a nice-sized theater, you will need to work on it consistently over a long period of time.