The 'Double Blind' test needs to be instilled upon all voters actually. Look at the poster, Read it, understand it... then cast your vote, if unsure, forget and move on.
As the very old way of thinking was instilled upon musicians that only men can play the Tuba, or certain wind instruments for it was believed only a man was able to generate the force that was necessary to play the instrument perfectly, as too were woman tasked on playing the violin, for it was seen as a woman's instrument (Correct me if I'm wrong on the exact instruments in this bias test, I am not sure if my memory serves me right)
As soon as they saw a woman on a 'man's' instrument on the lineup for auditions for the orchestra (or a man for the 'woman's' instrument), does not matter how good she (or he) played, their prior bias will make the judges vote them badly. International law was made back in (insert correct date here) that all auditions for all musical instruments were to be made behind curtains, the judges were not allowed to know if the player was a man or woman untill their decision was made, and sometimes even then it was kept a secret), the person was shown the door if they even so much as wear high heeled shoes or a dress that will give the judges the idea that the person was female. Even subconsciously you make a bias "This guy/girl can't play just because of this and that"
What do I want to say with all this?
Easy, base the vote on the poster alone, not because you think 'this person can make posters, therefore it is good' still does not mean you should ruin it and bomb everything though
Personally, I work on this basis (and something of Jammys as well that it's the end product that counts) and if the poster refers to a joke, or a series that I am unfamilliar with, I pack my vote away and move on, no need to vote when you don't know, I'd not want to give it 1L just because I don't get it, and spoil the makers chances of getting a perfect 5L or vica versa... anyway, that's enough rambling on for now