My problem with that idea is that when you're commenting and encouraging small members you often don't get any upvotes because they have to vote at 100%, so they limit their votes. It could become costly to then communicate with them and they would lose even more encouragement. When I started a little community of homesteaders were encouraging and looking out for each other. Our votes were near worthless, but the communication was priceless because it kept us going. A fee would have stopped that dead. We could have moved communication to discord maybe, but it takes away from a discussion focused on a post that could add value.