I always hear that once you hit the middle limits - 10/20+ online - that it becomes much more important to know your opponents and play the man since your edge is much smaller and you cannot afford losing extra bets. So if playing the man is so important at this level, how is it that people are able to play 4-8 tables at this level and not worry about the fact that they can't possibly keep up with 40-80 different opponents? Are their experience and instinct levels so high that their natural edge overlaps what they are losing by not knowing their opponent?