The Mario Bros game would always be a good part of my childhood gaming history and to some extent, there are still some of their games that I still play.
I have never seen where PayPal charges $3 for $10 transactions. I don't know how you did that but it's my first time of hearing such. Even for $12 transaction, they only charge $0.84.
Yeah, it's something that I feel they have experienced in multiple games that have released in the past and should have found a way to stop it permanently by now.