Who, in this day and age?? How about nine out of every ten people you meet in your life (not just your circle of friends). You make it sound like it's as easy and common knowledge as tying one's shoes. Don't assume that because you can do something, everyone should be able to.
The reviewed model here is hardly "twice the price" and is actually a very good value: I just priced out this system on Newegg and it came to a little over $1,600. So throw in the labor cost to assemble it and the shipping costs to distribute it, and it's actually a very good value. And YES, I know that HP doesn't pay Newegg prices for their parts, but consumers do.
No one says you have to pay full price for parts from a retailer like Newegg. If you were a budget minded person who shops around you could save significantly. Saying "twice the price" was just an exaggeration to make my point of saying it would be cheaper to build it yourself. Even if one does not know how to put together a system, it would be easy to find someone to do so at an extremely affordable price. I will build entire systems all day for $20-$40 labor costs.