Well, that's all fine and dandy. But performing for the same number of people, stadium dates are generally much more profitable than arena dates, even though I could see the latter grossing more. Gross is fun for receipts and what not, but profit is obviously more important and the reason most artists don't even bother to make the trek to Australia.
That said, of course Katy will gross more in Australia. We're talking 23 arena dates vs. 4 stadium dates. She'll obviously perform for way more people.
