I left from Europe to Australia because I drank before going to work (Java dev). Came back 3 years later not only with 7x savings because the startup had a successful exit, but also with a lifetime more of experience, I've learnt how startups worked (and Scala and product marketing and open source and HN, Howdy HN!) and I came back to successfully create mine, and I now own my job. Oh and it's a good step towards product management which I love.