I think I'm gonna have to go against the flow a little bit here. The hype surrounding building their own computer from scratch comes from people being proud of building something themselves. They don't like the idea of paying a little bit more for something that someone else put the time and effort into creating. When you build a computer from scratch everything about the computer feels like its yours, its like your own personal work of art. Buying a prebuilt makes people feel like the computer really isnt quite their own, instead it feels like a company is allowing them to use something that they still own. Everyone has their own things that they are proud of and around here its all about building their own computer. You will never convince people around here that buying prebuilt is a better option even if it is.
So is building your own better then prebuilt?
yes and no, you get the satisfaction of creating a work of art and making something that feels like your own while saving maybe 25% at most, if you spend a decent amount of time searching around. It is not better for people that know nothing or not a whole lot about computers and how to fix them, because while constructing the computer and getting it up and running isnt the most difficult thing in the world, it isnt that easy either, and when things go wrong with a prebuilt you have the warranty and the support of a company to back you up with.
Even for people that know a good amount about computers there are many things that can make the extra 20% price tag on a prebuilt more appealing, like warranty, support, not having the worry about accidentally returning the wrong component to newegg, not having to spend a while constructing the computer and getting it up and running, waiting for all the components to arrive in the mail, not having all compatible components etc. etc.
If you don't know alot about computers but you have patience, your willing to learn from your mistakes, your looking to save as much money as possible, and your somewhat hands-on, then trying to build your own is not a bad option.