User blog comment:DancePowderer/How Bounties Actually Work/@comment-3279487-20121218143604

There is another important point to keep in mind: as Jinbe said in chapter 628 (though it could be a minstranlation), once you clear the 300.000.000, it's harder to go higher, so bounties like 700.000.000 are very unlikley. This explain why with all the ruckus Luffy did after Enies Lobby (thriller bark though it was cover up, punching a world noble, impel down and marineford) the bounty increased only by 100.000.000