== Definition ==

I came here for an explanation of what a PSL is. This article helped me not one whit. What does "a license to buy tickets for a certain seat" mean? A license from the state? A reservation from include a quote by an owner about how the PSL is different from just raising ticket prices?   
Think of it as a cover charge  you pay five bucks to get into the bar, but then you gotta pay more if you want to drink.  Only difference is, you can leave the bar