I was foolish enough to play my 10 first games when this was an issue and KoH maps gave almost nothing for winning. It was 4 KoH matches, we won all of them. Then there was 2 lost matches on non-KoH maps, 2 wins against leavers and 2 regular wins. Got placed at 50 for that. Not like i'm complaining or something, but it was really weird placement for winning 8 out of 10 placement games.