Not sure about the 40% thing CS. But after a quick Google, a job doing this will pay up to 15 an hour plus bonuses etc. Or to put it another way £28,860 for a 37 hour week. Not bad for an unqualified post is it? Then the companies who employ the collectors take whatever their cut is? Makes you wonder what is left for the abused children and sickeningly (in the ads) anthropomorphised pets?
Basically your £2 a month donation over the year won't even amount to two hours pay for the Chuggers. No wonder they all manage a fake smile! As I suggested, a business not a charity. Gotta despise it.