I agree that "green-washing" can often increase the price of a product - even when it's complete rubbish - take those "eco fuel magnets" sold by a number of big supposedly green concerns for instance. Discredited as pointless all over the world but still banged out at £20 a time or whatever. Had a big argument on the subject with the head of one such outfit on another forum and he was threatening all sorts of legal action and so on - but never took any funnily enough - wonder why that was??
The other problem of course is that the people who do leave those little foil trays all over the place - and I've picked up dozens along the canal - are unlikely to have the faintest interest in "doing the right thing", and so are unlikely to give it a try. Sad - but true.
Andy