I think Wu's got a couple of reasons for going. For one, it's probably the best opportunity for her to connect with her network of sycophants and campaign donors, most of which live out on the West Coast and also like to pretend they are important people in technology. I bet she uses the chance to shake them down for more money or at least more fluff pieces from the bloggers and writers.
The other major reason for going is that it gives her something to do (or at least pretend to do). Brianna's days consist almost entirely of Twitter sperging and video games; it's a life devoid of purpose. At least when she's traveling she can pretend that it's not the case.
She is (see the moon rocks stuff, her refusal to bring up Rev60 anymore, and the countless deleted tweets that have been mocked) but I don't know if Wu fully understands why the things she does are embarrassing and draw ridicule. Her narcissism and ignorance keep any real self-evaluation from happening.