If I make it to purgatory I think I will yell "Jackpot!" And start singing "Amazing Grace!" right away. If we make it there, at least we will know without a doubt that we are saved. Seriously - it will be the happiest day of my life at that point.
Another advantage is that we will get to see Our Lady once in awhile as she frees souls from purgatory on First Saturdays. "Like - I think it's really, really mystical down there, ya know? Yeah." (Imagine Cyndi Lauper saying that while twirling her gum.)