Looking at my history (pretty active player) I've used about 184 MB since June 24th (I am not as active on weekends so for the sake of this example I actually played 18 days out of the month averaged about the same per day). On average that means about 10.2 MB per day of playing (looking at the graph, however, I would say I used about 20 MB the day of the event as I was out for about twice as much time that day).
Looking at my history (pretty active player) I've used about 184 MB since June 24th (I am not as active on weekends so for the sake of this example I actually played 18 days out of the month averaged about the same per day). On average that means about 10.2 MB per day of playing (looking at the graph, however, I would say I used about 20 MB the day of the event as I was out for about twice as much time that day).
I don't think that is considered a lot