Partly because I want to be a professor, and I need a PhD for that, and partly because I just can't imagine doing anything else. I absolutely threw myself into my senior thesis as an undergrad, and it was intense, and difficult, and frustrating, and I loved every second of it. My thesis was on translation, but now I'm hoping to focus on the creation of identity in immigrant/minority language novels, and how multilingualism and translation impact the development of identity on individual and community levels. Hopefully, this will be applicable to the real world, and I'll gain a better understanding of how to foster working multilingual/multicultural communities in the United States.
Also, most programs require you to learn a bunch of languages, and I'm 100% into that.