GiveDirectly, a charity that focuses on providing direct cash assistance to poor people in developing countries, decided to ask its team (or at least those members who were from or had spent time in the United States) if they do the same thing on the home front: do they stop to help homeless people soliciting money in their own cities?
2 people said they give most of the time, 5 said they did so sometimes, and 4 said they never did; you can see their full explanations here. Three of the four stating they never give cited the greater cost-effectiveness of giving to poor people abroad rather than the US, which is hard to argue with; aid money goes a lot further in developing countries than it does in rich ones like the US. The fourth argued that homeless people soliciting money might be more likely to misuse it than the rest of the homeless population. The two who said they did it usually noted that "the money is likely to be of more use to them than it is to me" and that the recipients as "likely to spend it as wisely as I could," respectively.