Because that would mean employing someone to empty them regularly, and as most woodland is few and far between in this country most woodland owners deem that an unnecessary expense.

I used to work for the Woodland Trust and believe that this is the right thing to do. Bins in woodlands do not get emptied often and will often overflow and attract unwanted pests like rats. Rats will also eat the eggs of ground nesting birds and cause other environmental issues.

If they are selling food on site then the food vendor should have a bin that their customers can use inside their cabin/cafe and dispose of the waste daily as part of the service.