12-15 posts a day is insane, i don't know with anyone who has that much to say unless they are just moving their fingers to avoid some dark thoughts they are trying to hide or if they see $ in it hah.
The question I always ask myself is "would I do the color challenge if it wasn't paid" and the answer is always no. 5 minute freewrite? sometimes. If it's fun for you do it.
I just try to put something valuable into my posts, I never worry about if it's gold, as long as it isn't copper :-)