Lets look at it a different way.
DOES YOUR SITE NEED OR BENEFIT FROM A VIDEO
if the answer is yes, then create one, if no, then don't.
Don't just create content for the sake of it, that way, when you do create a video and it actually serves a purpose then it has much more chance of going viral.
As the name suggests, explainer videos are a great way of presenting a difficult process, or helping people visualise a journey. Take a look at your support emails or FAQ's, what are the common pitfalls for your customers? could you merge all your FAQ's into an explainer video? Chances are, your competitors will have the same issues and so will their customers, if you solve your problems with an explainer video, you also solve theirs....viola your video is going viral.
Some reading: