Let's add up the total extra costs that most
people will have:
keyboard: 0
mouse: 0
SD card: 0
[have you spotted the theme yet?]
[...]
Oh, nonsense. Doubly nonsense.
First, a keyboard - to pick the first item on your list - is no less a
cost just because you've already got the keyboard rather than needing
to go buy a new one. (It makes it harder to put a monetary amount on
the cost, but it's still a resource you have to use, even if the
monetary part of it has already been paid.) Even then, taking a spare
out of the spares pile and putting it into live use is still paying a
cost.
Second, what is your basis for asserting that "most people" will have
spares of all those things just sitting around looking for uses?
Unless you've actually done studies of large numbers of Pi buyers -
numbers large enough to have statistical validity - to find out what
fraction of them have keyboards, mice, SD cards, etc, lying unused, I
can't see this as any more your spouting your opinions, guesses,
preferences, whatever, than the people you castigate for doing that.
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