Because the GGGP asked 'who wouldn't pay $3 for this'.
The charitable interpretation of his question would be "who, of the people who find this topic interesting, would not be willing to pay $3 for it?".
The question you are presumably structurally answering is "why wouldn't absolutely everybody in the whole world pay $3 for this?". In answering that, you were either being insulting to GGGP, or looking for a pretext to wedge in an "I don't care about this" comment. I suspect the latter.
and
> I suspect the latter.
Interesting to see how selective you are when using that charitable interpretation technique.