09-12-2017 10:28 AM
It does tell you on the seller fees page, and on eBay's page about using Reserve - If you add a reserve price to your item, you'll be charged a reserve price fee.
Plus, when you send your listing live, you click on a button that confirms that you want to go ahead and list it with the displayed fees. Why didn't you look at what you were authorising?
If you just start an auction at the lowest price you'd be happy to accept it costs nothing.
You can view a breakdown of that invoice in your My eBay>Account.