I'm not saying the streamer creates a post. I'm saying you publish one that doesn't need to be rewarded. It can sit there forever, and every time someone logs in to chat, a comment is created under the post you published, and those comments would collect the votes placed upon what is being voted for in chat. That way votes can still occur, and the entire chat doesn't need to be on chain. People aren't "tipping" the posts in chat, they're "tipping" the people, in chat, for whatever reason.