[Elven-Maiden]

Maybe Shelob saw that worldly power and possessions were her undoing, and wanted to be different. [img]smilies/smile.gif[/img] What I think, however, is that Shelob was too hungry to care. As she didn't get a whole lot of food, it's plausible to think that her first concern was herself. If Sauron had given her Orc generals more often, she might have become greedy for power too. Also, Ungoliant had been lied to. Morgoth promised to feed her with both arms, but when he did, he kept the Silmarils in one hand, and wouldn't give them to her. That broken promise might have been enough to start thirsting for power.