I don't think you do. Cause if you did, you would realize that the dosh nerf for long games is just too much. It was already a lot easier to play short and medium games, but right now, you're both much poorer in long games while facing more enemies. Doesn't matter which wave. For some reason, I can afford to buy more at wave 5 in a medium game than at wave 10 in a long game. That's absurd.