According to the club’s website, the Mongols are, “The baddest 1%er Motorcycle Club known worldwide.” I’m assuming that the 1%er does not refer to their position in the income distribution curve but the concept that the members are not part of the law-abiding 99% of motorcyclists.
|Modern queue and bike|
The branding and signalling associated with the Mongol’s trademarks reduces their transaction costs. Sporting the logos means that members can quickly and cheaply be identified, and identify other members. Much easier than quizzing each stranger about their membership. Particularly if you're selling illicit goods.