There's a lot more involved in shipping an animal than a game.
In my case all they did was put a another box around the original box, and put a shipping label on it. No protective packaging or any other measures. So It didn't need 18 to 20 dollars American worth of shipping costs, for a carboard sleeve and a sticker.
Heat packs, insulating materials, and such do cost money for the shipper though and are an honest expense. I won't begrudge anyone for recouping those costs.