I don't know exactly what your definition of success is, but products of hyper-specialization do indeed make money. Etsy is eBay for home crafts, Twitch.tv is J

I don't know exactly what your definition of success is, but products of hyper-specialization do indeed make money. Etsy is eBay for home crafts, Twitch.tv is Justin.tv/YouTube/Ustream for video games. And of course there are thousands of enterprise solutions that are simply domain specializations of Microsoft Office and Dropbox that are doing quite well.