>>19117307A structural advantage of Fishtank season 1 was that the reward money was relatively small, so that contestants were unwilling to get too crazy even if they were all a little weird and were being goaded by staff.
For example, both the fish and the staff flipped out when Betty flashed her boobs, something you'd see at a music concert. But that was going too far.
If the reward was two million dollars contestants would be trying to kill and/or fuck each other. By day three everyone would be injured or quit and the police would have been shutting the thing down.