Well, my vote is a pretty safe bet.
People like polls. Voters always way outnumber posters in polls, so it seems something about them attracts people to come on in and click on something, even if they don't post.
Silly polls (and threads for that matter) appeal to some people, and not to others - which is really no different than other topics really - some people want to read about certain settings and others don't. If you don't like them ignore them and move on to topics that interest you.
I find them (silly/light hearted threads and polls) entertaining, and think some others do too. And in the end, being entertained is why I got into gaming in the first place.
And seriously, there ain't that much to talk about until we have more on the game. Covers been done. Schedules been done.