For work
Why?
Because i can
1. Read the latest microsoft (and other sympathetic american guys) issue on top it trends and thus take a precedence over my not so english-like collegues
2. Deal with foreign clients without any translators. As you know foreingners pay n bucks, and bucks is heavyer than wooden ones
3. Impress HRs (like Iana Khrykina). Knowledge of a foreign language is always a mark of some exellence.
4. Move some day to the East at last