SBS 91
D: All the characters of “Yonko Officer” class have very high bounties. Do their bounties ever go up simply for the reason that they are the Officer of XX? P.N. Rice LOVE
O: Yes yes, that totally happens. After the Dressrosa incident, all the people involved with the Straw Hat Crew got a flat 50 million increase.
The crew members’ bounties often increase with their captain. This is because it is actually fairly difficult to appraise the strength of each individual person and assign a money value to them.
You cant compare YC and others to Captains in terms of power level by their bounties. My point stands
You also can't compare Cap to Cap by bounty as we know from Sabaody (Lid having 320 for terrorizing bunch of vilages).
And don't forget Sanji getting 330 for being a Vinsmoke and Guffy getting 1.5 for infiltrating BM territory and escaping alive + also having a grand fleet.
Oda made sure to point out that not always it is about individual strength.