Interesting question! Based on looking at a few accounts on Steemauto recently, I think frequent posting creates more value on Steem - with the proviso that the posts do have to have some quality and substance.
I personally don't seem to be able to do this, though I admire those who can. It might be due to having worked as a magazine journalist for years, where we had to make sure everything was checked many times before publishing. Actually I find it easier to do simple, loosely-edited videos than simple, loosely-edited posts.
But I'm taking a different approach anyway. I usually use Steempress to post from a "conventional" blog to Steemit. From past experience I know that it can take years to attract attention to a blog. So I'm creating a blog, and all the posts go on Steemit. I suppose it's a kind of hedging approach. I have a strategy in mind for building up the blog, but I never seem to find the time to put it into action...
With videos, Dtube now allows you to upload existing videos from YouTube. You can earn DTC from them, but not Steem (or is it the other way round?). I think this more long-term strategy could make it profitable to put more effort into the videos you post on Dtube, and at the same time, it should encourage more well-made, quality, and less "ephemeral" videos onto the platform for viewing. Time will tell.