I just remembered something very interesting.
Lady Gaga has been touring in 2009, 2010, 2011, 2012, 2013, 2014 and she will tour in 2015 as well
She is the richest Celebrity under 30, your faves sans Taylor and JB are nowhere to be found. So let's not
Of course when you tour so much there'll be a moment when you won't be pulling them 2m per night.
PRISMATIC TOUR is Katy's 2nd tour, and more like her first. Her last tour was 2010-2011 and it was an embarrassing attempt. You realize that NOT many people have seen Katy Perry live before ? And she is very huge right now, of course she will have demand
She has had countless number 1 hits since her last tour. It would be embarrassing if she can't pull 1.3 - 1.4M average per night with that promo campaign.