User blog comment:Fintin/Bounties/@comment-2031609-20100709211337

I think they'd at most raise it to 500,000,000 because even if the WG wants to keep Impel Down a secret, the entire world SAW Luffy during the Whitebeard War so there is no covering that up. Plus even thought the whole tenryubito was a "minor" event, I'm sure that they will be pulling for a bounty raise as well.