Funny enough on ours, we have a forum specifically for Polls. The point being that with our general chat section being so busy (500-700 posts a day) Any Poll added disappears off the front page very quickly unless I sticky them.
Too many stickies on the front of a forum is messy so I don't like to do it. The way I look at it, if a thread is interesting, it will stay at the top on its own, because people will keep adding to it.
With Polls, many will vote without adding text, so the poll slips down the page very fast. Putting it in it's own forum means that the current polls are easily accessible.
Not a big fan of Polls myself, and rarely vote in them, but the members like to have them so who am i to argue? We also have an 'unwritten rule' that every poll must have a variation of a 'don't give a damn' option
