Actually don't get much BS, just bad farmersto be fair, you also get shit like supports rushing aghs/dagon's. mid's that are 8-0 20 mins in but still haven't completed an item and offlaners that have had every chance to kill a support or carry and simply don't know it. afk junglers or lane cutting axe's seem to do the best in the normal ranked brackets.
Australian servers are a bit different tho, you're jsut s likely to get 5 supports as 5 carries