All you have to do is remove the cookie they add to your browser and they can't track you or recognize that you've voted or been to the site at all.
I think it's a waste of time and effort but some people (mostly kids) will do anything to have their favorite in the lead. Even if that's something as silly as "stuffing the ballot box". They also changed the format for voting. Instead of like/dislike on a 1-10 scale.
She's losing fans in droves every week with her attitude and behavior. I think there's more post that are "I was a fan but not anymore after she did so and so" than there are people that didn't like her at all.