There are two ways to vote that also stop robots, scammers, hackers, and people that would try to manipulate the poll. One is free, the internet standard email and followup verification that allows one vote per email. The other way, which is anonymous, goes through a legitimate well respected third party for payment to ensure no shenanigans and that I don't have your information.
Because I want everyone to be able to express their opinion on the question.
Paying fees and taxes mostly, but also paying for the web hosting. Servers are not free. If there is any profit, it will go towards student loans.