I'd rather donate to a tin rattler than to a chugger who is paid to get people to sign up. We have so many in Manchester and not just on the weekends, it's often like running the gauntlet down the main shopping street (especially when you throw in beggars, buskers and the like, free papers, surveys, evangelists etc...). They can be quite aggressive too, following you down the street and trying to make you stop then the guilt tripping.
They were talking about restricting them a while back due to the issues and think they can only now stand in certain confined places in town.