Re:Switching from macOS: The Basics
by mikeash on Wednesday November 02, 2016 @10:13AM
(#12854898)
Because for most people, "0 dollars" is not a sensible answer to that question. Getting something for free is perceived as a separate kind of action from purchasing something, even if you can ultimately boil it down to the same "exchange $X for Y" process.
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I mean, of course it is; but it's the obvious numeric way to encode the response "fuck you is how much." Like punching in $0 as a tip on a POS reader.