There's hardly a day where we do not encounter some brilliant idea or another about applications and products, which immediately entails the question: "how come it wasn't done yet?" A very good question indeed.
It's all a matter of experience. Like a successful trip forever memorable for being a good experience – that is exactly how a good experience is retained in one's consciousness in the virtual world. It is also important to remember that a pleasant experience, not only quality content – is what leaves an average surfer longer than 7 seconds on the page he is in.