A Decent cooler is advised for everything. -_- It will keep your temps lower for every single thing you do. Also, you probably wouldn't need better coolers if you guys didn't buy referance cards. Likewise "Optimisation" won't magically lower your cards temp by 5C+. Whatever SE does won't lower your heat issues.
If the 80$ is spent on for more than just this game, I am sure you would see the need too.