Bounties make no sense. Same as when Oven and Daifuku got only 300mil., while being hyped up next to the YC's and Peros who had a 700mil. bounty. They also had good feats, so it's surprising they were so much lower than Peros.
And now Marco apparently has a Bounty lower than 1 bil. lol - despite all of his feats and hype coming from Yonkou and the Gorosei.