Keep in mind while you're reading the grosses for south park that south park is a Low Budget movie. It cost under 20million to make (not a lot by today's Hollywood standards), is on 1000 fewer screens than Wild Wild West. South Park has not been designed to be a blockbuster. Matt and Trey have chosen the path less taken. And they are doing damn well despite that: Better reviews than WWW and better per-theater average grosses.
Alan