Using polls to make your blog more interesting
First of all the main reason you have to have polls in your blog is just esthetic, polls give blogs a professional look, and people love to fill polls when they visit a site.
Other reason why you should have polls in your blog is to recieve information about the people that visit your blog, with polls in your blog you can get important information about the likes of the readers of your blog.
Another reason is that polls can be a pretext to write an article, for example, you make a poll and you get information, you can make an article about what the result of the poll was.
Regardless polls are easy to make and you do not lose anything making polls, there are fun and very usefull.
So go and start making polls.