You missed at least one category:
4. People with machines that won't run an upgrade.
I've got a few boxen at work that don't have the memory to handle anything bigger than XP, and the software I need them for isn't available for a Linux/etc.. Besides, they work for what I need them for, so why should I bother? The machines are completely static: the software I use on them is frozen and they aren't worth putting anything else on them, so why fuss?
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You missed at least one category: 4. People with machines that won't run an upgrade. I've got a few boxen at work that don't have the memory to handle anything bigger than XP, and the software I need them for isn't available for a Linux/etc.. Besides, they work for what I need them for, so why should I bother? The machines are completely static: the software I use on them is frozen and they aren't worth putting anything else on them, so why fuss?
And 150 randomly chosen reptiles.