I use Linux as my primary OS, I would use uTorrent if it were available for Linux, and I did not vote in this poll.
That said, though, you're probably right. Internet polls are easily manipulated by e.g. social news sites with dedicated target audiences.
In that case, it is already pretty remarkable that 3254 from a group of people who currently can't even use your product want it to be developed for them. If that happened to a product I were making, I sure as hell would begin targeting that platform.
It's 1300 people, not 3254 people. The way the idea bank works is that when you make a new account you get 10 votes, and can allocate up to three of them per idea, which is what happened here.
Linux users traditionally have been more involved in a community, so it's entirely conceivable that next to 100% of potential uTorrent Linux users have taken the opportunity to vote whereas only a fraction of a percent of utorrent's total user base voted for the second highest rated feature.
I would probably not use a poll like this to direct the future planning of my product.