With your answers I ll be part of this program and contribute something I can..
Welcome to Chennai Spider.
To answer your concern, polls directly do not add revenue to the creator, responder or to the site. However, if a poll is interesting one and if we can have some good discussion on the same, that may result into revenue for the site!
For example, if we talk about this poll question "Which is the Best Attraction in Chennai", this might result into a source of revenue. How? Well, with the proper use of SEO, we can make this thread as a part of top most result of Google search. I hope I am making sense!