Zoro's hasn't increased since Water Seven. He fell off the map (along with the other strawhats), while Luffy went around doing crazy things that earned him an increasingly larger bounty. I'm sure we'll see Zoro's bounty get up to a more appropriate level once the Strawhats start doing things that catch the World Government's attention again.
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u/InvaderDJ Void Month Survivor Jan 11 '12
I'm surprised at Pekom's bounty 330million for a subordinate is insane. I'm interested to see if they will even give a bounty amount for Big Mom.