Yes, I think theres a case for picking up litter of others on the hill whether on race day or later. 20 packets on a windy wild day out of a field of 400 may be pretty good. A few who couldn't really be bothered to look after their litter and a few who knew nothing about the mess they left behind. Someone behind or on a training run picks it up on their behalf and rightly gives them some stick on here as a reminder.