The 2 players are considered non-decision voters.
The game is a team game with that teams making up 5 each side. 2 people out of 5 is enough for a thought of no, yes or maybe.
A no vote means "maybe, we will see". So players will just watch and wait until the end to cast their vote, so that if they see a spark, anything during that vote they can and will disagree and try win the game.
To be honest though you won't learn how to properly play if you constantly vote to surrender. Shit, just yesterday we won a game we were behind close to 7k gold lead and with no towers except top tower and inhib. So yeah you can win a situation that seems dire, maybe you should try that instead of giving up?
Also why would they let 3 be enough for surrender?? That sounds so stupid, that means if you had a trio group you could surrender even when winning and fuck over your team/troll. Pretty stupid if you ask me.
I just think you should learn how to come back, if you keep this attitude you will never get good or even okay at the game. You will forever remain crap.
EDIT: i just looked through your game history, seems like giving up is your best strategy from the looks of things. You have a poor game then give up. Totally discounting everything you say from here out.