This sounds like a really nice idea, for casual conversations and also to promote the social media microblogging elelment at Hive.

But the challange would be making people take on this leap. Why would someone like to post in a community denying him rewards, while he can make the very same post in any other community like 'Gems' with getting rewards.

One argument could be the boost of engagement. I.e in situations where the author is looking for feedback for something, or maybe some newbie looking for getting his question answered. But someone prominent who can get the very same work done with a 300 word post along with getting rewards would probably refrain.

But here are the ultra positives of this move-
1.) Increased activity - undoubtedly, a lot of newbies will flock there, and pros too in comments.
2.) Higher reward potential for efforts. As post rewards are gonna be distributed among commenters. People will always have a place to contribute and get rewarded, instead of always trying to come up with something to write and that would eventually fetch them pennies because of their small footprint.
3.) A forever open door to rack up engagement for users and getting themselves known, eastablish their authority at topics.

Challanges -
1.) Fair reward distribution to commentors. How 🤔 it's gonna be executed.
2.) Dealing with spam and zero creativity comments and autocomments.
3.) Moderating Comment plagiarism.

Other than this, I think Manipulation Station is something very niche. But if thats something you personally want to eastablish - all good 👍. For this particular project I think a community like HiveReddit and Quorive will be better and probably a dedicated front end too.

Would need more thought, can definitely be refined and is seems like a super idea 💡 👌.