If I was homeless this would be my shtick to get the monies.
I would have a sign with a question on it, like “Which is better Coke or Pepsi” and then have room for tally marks underneath. Then I would hold a sign that says “1 vote is free, 3 for $1, 20 for $5, 100 for $10” and then ask people what they think and make sure that everyone sees me adding to the tally board so that they know it is a legit survey.
I would then make sure I was always was in the same place so that people could “check in” to see how the tally is going, and then rotate to new questions every couple of days. The reason it works is because people want something for their money, and the one thing that everyone wants to share is their opinion, so they might feel that they are getting something in return for their money given. Heck, if I saw it I would give a buck to vote (and I don’t give money to homeless people).
I would be so rich if I was homeless.