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The reality is that most people don't upgrade things. A typical user will never touch the innards of their machine. For the majority of users, something like an iMac is ideal. With cheap external drives and hubs, you have pretty much all you need. Assuming there is enough room for ram, the only thing you'd every want to change would be video card and/or main processor. And most people would just buy a new/different computer.
There are lots of specious selling points that people give for things. I'm noticing this in the digital photography world. You wouldn't believe the amount of bandwidth people chew up arguing specifications, capabilities, and showing pictures of newspapers to judge lens sharpness and brick walls to determine focus and distortion. I'm convinced that 90% of them never shoot a "real" picture...they just test their equipment and argue about it. Same with computers...people will use "upgradeability" and "number of software titles" as selling points when the reality is that *most* (not all) users will never go inside the box and will use about 5 apps on a regular basis.
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