Bets would be too easily exploitable, also people might bet for the enemy team and sabotage their own team. There already is too much people not trying to help their team win, but rather just get kills, or even just sabotaging because they troll or whatever. One way could be having it only possible to bet on ones own team winning the round, but that would just give more money for the clans steamrolling the others. However, with banner balance off and only being able to bet on ones own team winning, this could be a fun addition.