NASCAR Question

Paul Menard, the NASCAR most improved driver so far this year is 11th in points with 2 top 5 finishes and another in the top 10. But in terms of money won, he is in about 30th place. http://espn.go.com/racing/standings Does this make any sense at all? He is behind drivers who have no top tens. He has only 1 bad race when he finished 38th at Martinsville. So, how does this make sense?