It seems to me that the rating of long contests doesn’t make sense. For example, in the just now finished JAN13, ACRush beat mugurelionut by the tiny margin of 0.006 (or 1 place, if that’s what counts). His already very high rating (~18400), however, has increased by a whopping 2500 points, while mugurelionut’s, who was rated much lower (~4500) has only increased by 1500.
Shouldn’t contest rating work in reverse, similarly to how ELO works? If you already have a high rating, winning should gain you a smaller increase (and, consequently, losing - a larger decrease) than someone rated lower.