Well Agent and Test Ament, you guys are just pretending there is no relationship whatsoever between guilds in GvG, that guilds don't team up together (make alliances) to fight other guilds...
InnoGames also don't say a word about profiting on other players GBs, yet, many do it. It is part of the game, and I could go on here with many examples like this one, where Inno doesn't mention anything, but it is just part of the game.
EVERY game that has any kind of war/battle between guilds, it allows for diplomacy and alliances. It is part of strategy. One can use it or not, but it is not forbidden, it is not against the rules.
No point in keeping arguing this matter anymore, let's leave it for the readers to decide for themselves.
Getting back to topic: raising the limit of maximum players in a group message would greatly benefit alliances or a guild that decides to divide itself into 2 or 3 different guilds so it can determine different goals or accommodate more players.
And here, you already mentioned that Inno already set the limit of 80 players in a guild for a reason. Unless Inno already mentioned what is the reason, it can be a purely technical issue, thus, having two or more guilds to accommodate more players is no problem at all, as matter of fact, it is not against the rules also