Fist of all, anything you enjoy doing is worth you time. However, if you are just trying to determine if it's the best format for you to grow an audience with, I'd say experiment a bit. There's nothing wrong with switching things up and testing the waters now and then. You might find you actually enjoy it more yourself and get a better response. We started our first "Random Monday video" as a way to switch up from doing our normal Thursday sketches, and they've ended up being some of our most popular videos and we love doing them now (and our audience loves them too). Our Thursday sketches still get more views but our Monday videos get more audience engagement because of the more personal format to it.