Depends KM, mass produced PC's can actually be a lot cheaper, so it depends on the retailer. A smart one will inflate the costs mind :P
They're usually 25%-50% more expensive than if you'd build them with retail prices (just like this one, which is about 720 if you build it) I'm not saying it's bad that people buy pre-built PCs, it's what I earn my money off every dayGotta be careful when building your own computer though, things such as shocking your parts can really damage them. Plus if anything goes wrong you can't just send it in and have it fixed for free, you'll have to do it yourself and if anything's broken say, the motherboard, you'll find yourself spending extra money on a new one.
^Yea sure if people don't know how to build a computer they should defo. buy a pre-built one. That's what they are there for. I wouldn't try to build myself a car because I simply wouldn't know how to do it :P Would just buy the complete carIMO, building computers is piss easy :happy:. People think it's hard because theres so many cords and crap.. but all it is, is plug it, screw it, connect it, play it.