Quick question: if I buy Don't Starve Together as a gift to my inventory, do I get 2 gifts?

"Includes an extra copy of Don't Starve Together. Send it to a friend!"

I would assume it would be after you add it to your library.

You activate it and the other copy stays in your inventory.

I will buy it right now, but if I have to activate too get the extra copy, you will need to reimburse me for the entire thing.

You only get 1 gift. Once you add it to your library, that's when you get the free copy added to your inventory.