The law of averages will play a minor role, sure, but on weeks where the left side does play easier than normal, you are going to see lefties make the show. In order to get an all lefty show like you had in Spartanburg, you're going to need it to be a round robin format, not the elimination-style match play that you see more of these days. So, a combination of favorable lane conditions and a format where everyone in the top 16 gets to bowl to the finish, and you have the possibility of a lefty fest on TV. All of this is controlled by the PBA- whether it turns out like this is up to the bowlers, but there are definitely weeks when the left side is allowed to make money, and other weeks where they aren't.