What was the reasoning behind someone's personal rating varying as a result of someone else's?
That seems more like a competition to beat others than encouragement to grow an individual reputation. I would have thought a mechanism that developed something like a personal handicap would be more appropriate? (Although it seems to work out ok.)
What would happen if someone with a score of, say, 7, didn't post for 90 days? Would their score revert to 10 or stick at 7 - or change because of other's scores have changed?
Life, don't talk to me about life - Marvin the Paranoid Android