Well, that I cannot really say. At 10%, you can reward a lot of comments - so try that for a few weeks. I'm not sure since my total is at only 10 cents so I vote with much higher percentage. I use 40% on comments, 100% on posts with good chance of rewards, and 60% on posts just to be nice, encouraging, and helpful. I'm not sure how I will do this at your lofty heights :)