Here are some more information.
"The main fleet of the Whitebeard Pirates alone had several huge ships and well over a thousand members, making its crew the size of a modest town. They had multiple ship's doctors with enough medical support to be considered a hospital."
"In the New World, people with Devil Fruit Powers were easy marks especially Logia fruit, which were the most powerful, and most likely to make their users lazy and reliant on them. Pirates like Jimbei, the Seven Warlords, and the Four Emperors were made of sterner stuff."
"There are tens of thousands of members of the Whitebeard Pirate Crew. And there are many more times that number living on the islands that make up his territory. All of those lives are under the protection of Whitebeard's flag."
"Sengoku seems to think pretty highly of Jimbei, Jimbei is the only one who shows up at Navy HQ. Boa Hancock the Kuja empress is one thing, but then you've got Doflamingo, and that slimy Croc all those Warlords are only concerned with their own personal business."
"Jimbei took position of Warlord in exchange for amnesty for the fish-man people."
"The World Government won't show mercy to anyone who dares refuse their Warlord offer and shows them up."
"A bounty amount did not always correspond directly to combat strength. According to some, it was the measure of danger posed to the World Government. Therefore, pirates active on the Grand Line tended to have higher bounties than those in remote regions, and defying the government or inflicting harm on Celestial Dragons meant retribution in the form of significantly higher bounties, as a deterrent to others."
"Red-Hair's harder to pin down than the other Four Emperors."
"People often imagined the Four Emperors living in palatial estates with every possible luxury at their disposal. Some were like that, of course."(Example would be Big Mom)
"Before the Great Era of Piracy began, the counteracting power against pirates like Roger were mighty Navy officers like Sengoku the Buddha and Vice Admiral Garp."
"When pirates battle pirates with pistols and swords, there's no rules or honor, just war. All the loser leaves behind is a dead body."
"From legitimate avenues like trade, port workers, and vendors of food and drink, to casinos, gambling, and show business, security of all kinds, weapons smuggling, even mercenary dispatches to distant wars every kind of economic activity within the Emperor's waters was closely related to the funds of the pirate in charge."