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what 'm currently leaning towards is that team can help you with recovery, maybe picking targets and other various off-combat matters, but equal chances in certain fight
Some people does not have to be really communicative (which is not rare among geeks, right ehm) and still enjoy bbg, that way it would be compulsory for player to get to team, otherwise be (almost) constantly losing...
maybe give lone player similar but different options so the effectivity is same but options a bit different...and teams for socializing then
I think you already mentioned players of your game(s?) always form alliances even if it doesn't have any in-game benefit, so I don't think it would hurt
I find this question rather impossible to answer without knowing more about the game.
Am I correct here? (except for dsheroh, I know he does not acknowledge winning a game as an important reason )