It's uncommon in this context, common in other contexts. There are lots of things you can buy in retail stores that might involve fees. You might pay extra for

It's uncommon in this context, common in other contexts. There are lots of things you can buy in retail stores that might involve fees. You might pay extra for using a credit card (versus cash) than the stated price to cover the processing fees. And it's possible that if you're using some service or intermediary for selling something then they might take an additional cut as well.