There are a few glaring exceptions like Google, but for the most part conventional desktop software sells much better than web software. Many web startups have no real monetization plan and are going nowhere fast, some inspired by attitude embodied in The Social Network's telling of "I don't even know what it is yet, how can we monetize!" I've actually had a friend tell me that his startup is not going to do anything to make money at first, because "like Facebook", they "just want to see where things go", or something like that. I think this attitude is pretty dangerous and misguided.