Because I don't want to start a huge debate or flamewar, I am going to put my claims as simply as I can for you three.
I agree on how it does not give you an advantage when it comes to PVP, but what about maps? As I said in my post, increasing gamma can be used to avoid traps, discover hidden chests, and gives an unfair advantage, especially at night. This is what I've been trying to explain, but I guess I haven't given a good example, so I'll give a short but understandable example of how this is unfair:
Player A and Player B join a match and team up. Player A has an increased gamma while Player B is playing a vanilla game. As the game starts and they gather on food, armor, and weapons, they come upon a temple, full of traps and good chests. The two decide to split up. Player A enters a dark room. Because with his increased gamma, he is able to gather secret chests and was able to avoid traps that would send him to the pits of Hell, boiling in lava and fire. Refill comes, and they decide to go back to the very same room. This time, Player B decides to get the loot and goes inside the room. He is having trouble finding chests as all of them are hidden, but doesn't come out as he falls into a pit of lava thanks to a trap he can't see in the very dark room.
This is a perfect example of an unfair advantage. The traps and chests were designed to stop the tributes from getting the loot, and with the unfair advantage playing a good role in this situation, it allows for the first person to get better supplies that would help him win. This is why increasing gamma is not allowed on MCSG.
You guys also talked about OptiFine and how it is similar in a way that it can give an unfair advantage. I know what you mean; I have seen several people claim that the mod should not be allowed. The reason it is allowed is because it does give an advantage to the ones who need it. For some people it is impossible to play Minecraft without OptiFine as they get very low frames, lots of lag, and slow responses. And yes, it is true that you can zoom by holding the Control key. This was a feature built in the mod. Because of this, we use it because it's there. Whether it provides an unfair advantage or not, it's there. Now, increasing gamma is different. It's not like you can just press a key to toggle it, like you can with the zoom. It's there, and it's staying there until you adjust the slider.
The reason I spent 35 minutes typing this up is because I want to show my side, not create a flamewar-argument. Feel free to agree or disagree with my points, but I am sticking with the side I'm on. If you don't follow what I mean, I'll just go ahead and type up another essay about my viewpoints, whether they are right or not.
Either way, increasing gamma is not allowed on MCSG, and what I have typed is the reason why and why I agree. It's the administrators choice whether they want to allow it or not, all we are doing is talking about the topic. It could be allowed, it could not. It all depends on what they think. Because of several interesting and good points made not only by you three, but by several people in this conversation, I feel that they will become involved and share their viewpoints. But for now, it's just going to be the community talking about it. I did not want to get involved, but I decided to so I could clear up some points, before I get counteracted by you three. I'm not offended, but I don't want to be involved in this. I may make a few more points about it, but for the most part, this is going to be my last post on this thread.
-Have a nice day/night
-Spice