Firstly, SF != Bay Area (some people on this thread seem to conflate the two). SF is only part of the Bay Area.<p>Despite what mchannon and deadfall say, the concentration of startups in SF, versus other areas in the Bay Area, actually does not have to do with money. SF is actually relatively far from venture capital than other places in Silicon Valley. Most venture capital firms are based out of the peninsula (1 hour south of SF), in suburbian cities like Mountain View (YC and 500 Startups), Palo Alto, and Menlo Park (pretty much every VC firm, like KPCB, Sequoia, A16z, Greylock).<p>Most people live in SF because 1) Young engineers/designers/others prefer living there, and 2) the density of startups/entrepreneurship is greater. The chances of you serendipitously running into someone "useful" is much higher - the sheer quantity of networking events, technology events, social events, etc. is mind-boggling. Compared to SF, there is literally nothing going on in Mountain View/Palo Alto/Menlo Park.