A lot of food for thought here. Regarding commenting, I think it would be a good idea to have a separate reward pool. Comments are by nature different from full posts, and it absolutely makes sense for them to only be competing against other comments. I'd also like to see separate voting power for comments vs. posts. But at the same time, let's also keep in mind there is more benefit to commenting than just voting rewards. Commenting is the main way that people put themselves out there and get noticed in the community, perhaps even more so than posting as there are a lot more content consumers than creators. Just by commenting thoughtfully, you can pick up followers, and more followers can be far more beneficial in the long run than earning a couple cents for your comment. So I comment as much as I can anyway, without thinking about whether I'm likely to be rewarded for my comment or not.