You've said it all, the reason why many don't have something on there blog is because they already target a markrt share of steemit blockchain, for some it is once a day for esteem, ulog, just name it.
Many also are discouraged to put in there effort when it might not have an interesting yield in terms of payout.
And they find it very easy to do such on facebook, that's the most bizarre part.
Some don't read post too, sometimes because it's too long, or they are just there for the upvote, many reasons abounds with this.
In all, we all have something to share, but the little effort of writing and editing with good picture is demanding. To be sincere.
It is the expectation and they generally know that what they put on Facebook isn't actually worth anything to most people who consume it.
Everything is demanding without effort to learn how to be decent at it.
Uhm, you're so thought provoking.