Quite frankly I think you are crazy.
Good, because if I was normal, then I wouldn't be stirring up conversations like this.
Everyone has to start at the beginning, being afraid to build a pc is just hogwash! This is Maximum PC for crying out loud! If you have problems you post them here and everybody tries to diagnose and fix the issue/issues.
Except that's the thing. There are people out there who don't want to go through an OEM, want a custom computer, but they don't want to build it themselves. There are understandable risks involved such as ruining your brand new $300-$500 part because you bent a 50 cent pin. There was even a post where someone was speccing out parts, but didn't want to build the computer himself (and was asking if say CompUSA or similar would build it for him).
8 gigs of ram is the sweet spot these days for gaming, so YES! the OEMs screw you on the amount of ram in their ps'c because they are trying to make a profit!
Of course they're trying to make a profit. But they do so by marking up the RAM to an asinine amount, not by gimping how much you get. For example, to upgrade an Alienware Aurora from 8GB to 16GB at the factory, it's $150. 8GB of RAM these days costs $50 on average.
Also, even 8GB is excessive. The number of games that have 64-bit executables you can count with two hands, and you don't get a performance benefit anyway. The only reason why you'd go 64-bit is to get more memory, and these games are ancient by PC standards. Windows also defaults all 32-bit programs in 64-bit versions of the OS to 2GB, unless the executable was compiled with the large address aware flag... which most games aren't. The only one I'm aware that does is Skyrim, at the behest of its customers.
So you have 2GB tops for games, 6GB for the rest of the system. And I would even claim 2GB to spare is just fine.
This goes for everything else as well, video cards are grossly anemic in ram and speed. The psu's are right on the edge of not enough. I don't know where you are getting your information...either that or you only play Spider Solitaire and not todays games.
Uh, NVIDIA and AMD specify the GPU SKUs to a specific GPU speed, memory type, and memory speed. You would be in deep shit if you were selling a GeForce GTX 670 that didn't have 1344 cores @ 910MHz and use at least 2GB of memory specced for 256-bit GDDR5 @ 6GHz.
And if PSUs weren't enough, they'd cause system instability and would fail real fast. Besides that, the last OEM computers I touched had plenty of power to spare, and one was from Gateway, of all companies.
Also don't pull out the "I don't know where you're getting your information" card unless you aren't backing up your words yourself.
As far as simply sending back a pc to get it fixed under warranty...I can see you haven't been to UPS and sent something lately...the shipping costs are huge today! I sent a motherboard in for warranty service and it cost me 12 bucks for just ground, if I wanted next day air it would have cost me 90 bucks! The motherboard only weighed 3 lbs, now multiply that time what a pc weighs....
Don't use UPS then. UPS and FedEx are private couriers that actually put forth the service to make sure that your package arrives on time and is handled with care (or more less). UPS/FedEx is often times early
when using 3-day ground if the sending address is within 100 miles. If I have something shipped via US Postal Service, I can expect a 3-day package to arrive within 3 days, even if it's been shipped from a 50 mile location. Hell, I've once tracked a package shipped USPS, it went from one district to another... that put the package further
So if you don't want to pay up the ass for shipping, use USPS. They take longer, but hell, to ship a small computer (which I plan on doing), the slowest service I can use (which would take about a week, tops) would cost me $30 to ship across the country. They also have a plus of delivering on Saturdays.