I totally get it. The reason I'm suggesting it is because I'm pretty sure you need about 1000 views per day or something before you see any ad money.
If it becomes something you can see transitioning, then totally do it.
If not, it's no biggie. I enjoy those little bonus shorts and your fans will too.
I might be aging myself here, but I used to watch "Dexter's Laboratory" as a kid and they had these framed stories in them as well. I don't think "Monkey" or "Justice Friends" could have stood alone, but I really enjoyed them.