When would/should you surrender? (poll)

I'm trying to see what percentage of us will "never quit" and those who will ff even while in the lead. Please feel free to comment your preferred surrender times an/or why you should/shouldn't forfeit at certain points in the game.

I know that there is alot of grey area between these options, but this is the best I could do without creating too many options. Please pick the one closest to when your decide to ff.

The poll doesn't allow enough characters for me to post my options so I'm just going to post them here as well.

1. I just don't feel like playing anymore. (winning or losing)
2. Team member is afk or dc. (even if not necessarily losing yet)
3. enemy team starts snowballing or a carry is fed. (small-moderate gold deficit)
4. Pretty much everyone on the other team is ahead and stronger than you. (would not win a team fight)
5. They would really have to screw up big time for you to win this because they are so far ahead but your nexus is still alive.
6. I always vote no, game isn't over until a nexus falls

Also I really do hate doing this because I don't want you to think I'm fishing for popularity, but if you would up-vote this post so that as many people can see this post, and I can get as much feedback as possible that would be truly amazing and I would be forever grateful!