Maybe I should post this here so people understand how bounty works-
Bounty = Threat(knowledge, Wildcard, influence) and Strength.
Threat- sometimes people get their bounty because of their threat, example: Robin(Threat-knowledge), Buggy(Threat-influence) and Barto(Threat-Wildcard).
Strength- some get their bounty because of their strength, example: Caribou because of his logia strength, Zoro/Sanji because of the level of strength the guys they beat..
Strength+Threat- some get their bounty because of their strength and threat they have, the people here always turnout to be the big bad wolf, the kinda people you won't like to mess with in anyway, example: WB, yonko, Doflamingo, Luffy, Ace etc.