"The growing popularity of SXSW is directly related to the rise of lottery ticket entrepreneurs. Those that think they will be able to hack some feature together and be the next Foursquare, Twitter, etc.
While that does happen, it is about the same frequency as winning the lottery. If you are going to start your own business you better do it realizing that you will not be the lottery winner and for you like me, will have to roll up your sleeves and get dirty for a few years before seeing the hopes of some sort of positive outcome."
There's one more part of the equation that most of these folks are missing. I call it the "overnight success that takes 5 years to happen." Every, and I mean every good business, whether it's in tech or another industry, takes much longer to build than people realize. My mom, who built a very successful retail business, once told me that "business takes patience." Probably the best business advice I've ever been given.
Overnight successes take years, and a big splash at a conference can't do it for you.