No, most of them are open-ended. I don't make polls for orders and stuff so it's just not necessary.

Depends on the question. If it's helping me make a shopping decision, I do - no sense people weighing in months after I've finished. If it's just asking for general opinions on a topic that will still be relevant in the future, then I leave it open. Also, you can still manually close the poll later if you want to. You can even go back and close old polls that were made before the forum change that added that feature. One of my 'help me choose' polls from September got bumped recently, and I was glad to see I could close it and let it die.

I do on time sensitive things, but not for everything.

only on things that are time sensitive.

I won't put an end time on a poll, unless it is time-sensitive such as choosing a toy I wanted to buy during a special promotion. It kind of bothers me when I see people polling on an old poll from months or even a year ago, voting on certain toys or lingerie the poster was thinking of buying back then. I'm sure the poster has already purchased the item, what's the purpose of voting on that kind of poll (except to grab points)?