-If you're not a member of the press society, you won't be on my list.
Is it common to say this that way instead of If are a member you'd be on the list?

-Obviously there's been a mistake. It's not like I squeezed
into five-inch booted heels for my health. For nothing?
The negatives would be most natural by way of explaining why someone's name is missing.
Yes, and Yes.
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 Avangi's reply was promoted to an answer.
Thanks, Avangi!