Some people have more than one shipping address, so they are not sent automatically.  (As an example someone may live rural but may prefer some parcels go to a work address in the city).  

I saw the fee appear on some listings while I was browsing - a few items I would have purchased otherwise but didn't because of that fee. It appeared on some of my listings as well, had an irate email from a lady I'd sold to before asking me why I was charging a service fee now!  Had to quickly explain it wasn't me doing it.