Because resources are desperately scarce, you cannot afford to hurt someone just for the sake of chaos. Every betrayal must be timed perfectly. If you strike too early, the victim will dedicate the rest of the game to ruining you, discarding their own chances of winning purely for revenge. If you strike too late, the target will have built an unassailable lead.
The answer lies in the psychological phenomenon of communitas —the intense community spirit and feeling of social equality that arises from a shared, grueling experience. When a raid team spends six hours failing at Oryx, only to finally defeat him through flawless execution, the euphoria is unmatched by easier, more accommodating games.
If you want to dive in, here is the breakdown of the current Kings Fall Bastard Games lineup: