Have to agree with OP.
I have been researching the last few weeks on building a new PC, its the first one i'm going to build in about 15-20 years. My first one was easy, 486-DX2-66, put in a whopping 8MB ram and a 420mb hard drive. We went up 1" from a 14 to 15" monitor that set me back another $300-400. The whole thing cost almost $3000.
These days, the problem starts with model numbers, they are all over the place, so many motherboard models and makes, then you have hard drives that barely have any difference to them to the layman and 10 page reviews on Anandtech on a SSD hard drive with tech gobble that doesn't make any sense.
The PC industry has got to streamline it for the average person. The Graphics cards looks like its moving in the right direction, although there are still one too many models for every chipset. I'm not saying reduce the number of models, I just think that its really overwhelming for anyone who looks online for parts and its difficult to get into.
It's not so bad once you do a bit of research but I think there are a lot of people who are turning to things like ipads and tablets cause they don't want to deal with nonsense like getting parts and having them not work as well as they intended (or getting ripped off for buying something they don't need).
Another idea would be if pc parts makers like Asus or Gigabyte just make all the parts for a PC, including the case, motherboard, power supply, ram etc etc and just let people pick and choose parts on the website