well done, very specific niches aren't easy to grow and you've done real good so far.
ever thought about a "fun with hair" set of videos?
more like a funny video that might start off with doing the classic dipping your head in water and flicking your head out with a wave of water, maybe in slow mo'
and things like putting in different color rinses, a 1000 bead challenge, putting long strips of beads in, how many pony tails you can make, a giant mo-hawk, an electric shock look with tonnes of gel making your hair stick up like crazy and general funny things to do with your hair, even one where you put on a bald cap and tell everyone you cut all your hair off! then pull the cap off at the end just as everyone was about to comment on their shock.
It would be fun and might turn out to be a popular addition to your more serious subject matter.