Just do it alone, that's best for you and your friendship with other. And if you are bet on individual irrespective of others choice and then gather around only to watch the game or to see who won the game then its good but when you all are betting on one together then someone will have to take the blame if you lose the bet. We can say we don't like that and we all share the responsibility among everyone but that's not the reality and that's why there's always misunderstanding happens even between the close partners.