I see what's your point and I agree with you, but we already knew this was a private initiative so it's not that they are trying to confuse people or something.
It would have been nice to see a similar initiative from UNESCO based on their scientific criteria, perhaps an election like this would not be too scientific since it's the people's choice, but atleast the result of all of this could be an educational campaign to let everyone know some of the most important monuments we have. There's nothing wrong in letting the people give their opinion about it, even if it's through internet.