Boss Bazzelflange wants more people fighting, and she wants 'em fighting better.
"Incentives!", she says. "We need to give 'em a better reason to brawl!"
So she has us build this zeppelin, see. Glorious views of the fight, all the fancy alcohol you can buy, and the satisfaction of bragging to your mates that you can go to a place that they can't go to. Y'see - she only lets you up if you're Rank 8 or higher.
You want to get up on the zep? Keep winning your fights, bucko.