I agree that by sheer numbers it comes out as an average but looking at the list I also see that it fluctuates a lot. Although in taking an average you would have to throw out these two there is a huge difference between the person that got 126 events in 1339 hours and the person that had 24 in 1320 hours. I guess what I was trying to get at was I have seen in my own games that it varies quite a bit.

I'm not so sure it's wise to use the leader board as a tool for checking the practical aplication of how events should be generated. I doubt that these are what the average player is seeing. Maybe a general poll would be a better choice since that would include all styles of play as well.
Im not trying to pick on you. My goal is the same as yours really, to improve on a great game concept.