Enthusiasts have bloody hands from all the little solder points cutting into the skin.
I've had a couple computer cases which I would get cuts from every time I did any serious work on. The cases were OK overall, as long as you didn't open them, just too many sharp spots in too many places. Fortunately my newest cases are a bit better, I don't think I've got bloody from any recent selections.
They think about matching memory chips
This is basically how anyone buys RAM these days.
Maybe a pair of video cards with multiple monitors.
I have given up on SLI, just not worth it. One high end card and basically everything runs at max settings anyway (maybe 1 notch down on AA, whatever) with far less trouble.