The only games in which I surrender are those in which the team is hopelessly toxic to each other, and at least one person is intentionally feeding/afk/ragequit.
"Hopeless" is not a problem for me, because I don't believe in it. It's simply wrong. The reason it's wrong is because the longer the game goes on, the more even the power gap is. Stall long enough and you'll all be at full build or close to it, whether you've been losing the whole time or not. If the enemy team can't get it together to even keep you from that point, they stand a very fair chance of falling apart.
You can deal with a fed Nasus, or any other fed champ with a trillion stacks, if you simply adjust to deal with it. It's why Riot invented the
to deal with very high HP champs.
There are people who argue with me about this in-game, and, um, they're wrong. Objectively wrong. I usually see two sides to any question, but in that, no. And even it it doesn't do anything, I will "Negative Attitude" anyone who says "gg" before 20 minutes, on either team.
So I almost never surrender, and honestly, I don't really care if three people say yes and two say no. Sometimes it's just a learning experience when you're behind, and sometimes you actually do come back when you just couldn't even imagine it.
I think that might have something to do with a 1-15 comeback in which I was once involved, and a lot of comebacks in which we were down in both kills and farm simply because their team couldn't get late-game together enough to really end it.
So, yeah. I don't surrender. Almost ever. I will always vote no, unless the game is legit unpleasant between teammates. Because the game really isn't over until they get at least two inhibs, and we have zero objective advantage. Even then, if they still can't end it, it's a big "maybe".
But that mostly applies to normals. I will never surrender in ranked, for any reason, simply because surprising comebacks tend to happen often enough that I'm happy to stick it out and see if they mess up enough to throw completely. And those feel very rewarding.