I'm curious to know what your current thoughts are behind this. As someone who intentionally has steered clear of both those areas in order to try to optimize financially I sometimes wonder whether I'm missing out on something. Obviously one can learn more from better engineers, but don't the brightest ideas from the brightest engineers wind up being written about online and/or presented at conferences at user groups and broadcast across the Internet? Or does having the opportunity to put time into a name-brand tech company for a while really increase lifelong salary or career prospects sufficiently to recover the money thrown away on rent there? Or is there really sufficient value in serendipitous collaboration/socialization to justify moving to one of these places? Is there some other question I've overlooked?