Why would that create any hype?
Not many people care about gigs on another continent to the one they live on.
EDIT: and the ones who would travel, could do without the expense of all the dates being on sale at the same time.
People often feel that something big and important is happening when they see headlines about it one week, then again the following week, and again the week after that, even if it's not really relevant to their personal plans. I think these kinds of tricks are used in marketing.
At least, I know that publicists work this way when they want to create hype for their celebrities.