I figured someone had posted about it. I just ran a Google search and happened to get lucky because usually it takes much more digging or else I end up on unrelated tangents.

I think it mainly exists for steemitblog, ned, and other Steemit related folks, along with higher SP users who are making some kind of community announcement. And I would suppose the kind you just made would be appropriate too. The problem I see now with it not being available via the post page is that I'd easily forget from one day to the next that I switched it to decline pay, and then end up sending out a post that I very much wanted payment for.

Better just to leave it on the 50/50 split. :)