well, all of the things you are talking about requires hardware + software. which is more expensive, slower and more dangerous than building web 2.0 sites that

well, all of the things you are talking about requires hardware + software. which is more expensive, slower and more dangerous than building web 2.0 sites that are easily patchable. that's actually a very prohibitive point, as most startups we hear about nowadays use software because of its low bootstrap cost and economies of scale