Cha, Boska!
/Jabba really doesn't like being threatened or told what to do. We saw what happened to Luke, and he was being pretty nice about it, even offered a gift (well, not really, it was all a trick). And rancors are always hungry, if not a little misunderstood, so Luke had his hands full after getting dropped. All this action is laid out in this excellent two story MOC of Jabba's palace by builder Martin Harris, where every scene can be recreated (and pretty much has in his photostream, check it out). Now I wanna watch Jedi...mmmm, slave Leia....