Question: how jabba the hutt gained power?
Answer: He wins it by paying the captain of your dropship to dump his cargo - you - into space. Leaving aside Dampe's great answer, another answer was quite simple: a dash of nepotism. Jabba was the nephew of Jiliac, the head of already-powerful Desilijic kajidic (src: Rebel Dawn by Crispen, Book 3 of Han Solo Trilogy).