Could we a have a horizontal line representing your average on the reputation graph as well as / instead of a horizontal line indicating the position of the value 200?
I don't think any of us have too much trouble figuring out where 200 lies on an axis marked in increments of 50/100. I think the average (possibly the mode) would be much more interesting.
Whether to use a median, mode or mean is up for debate, but to clarify, when I suggest using the mode I don't mean highest frequency calculated from raw data, which is just coincidental. What I mean is frequency calculated from rounded-to-nearest
x values of reputation, where
x is 50, 100 or some such interval.
Here is a sample of normalized-rep (rounded to 50) frequencies from my history for December. As you can see, the mode is 250, which is a pretty good indication of my scores for the month.