anchor: uh because otherwise uh you know they're not going to go house to house collecting it and you're not going to bother if you have one bag full to drive all the way to some recycling center to turn in just your little plastic peanuts
positive: They aren't keen on picking up recycling from your house, and you won't go to the center if you only have a little to recycle.
negative: They can pick it up from your house, but you probably want to go to the recycling center yourself.