Even though there's quite a bit of effort put into making the big YouTube and Twitch people look small time, there's usually a lot of lawyers, partners, and business stuff in the background complicating things.
If you have any further questions or doubts, keep in mind that you can always find additional information on G2A's FAQ or by contacting us on live chat or ticket.
This is what I am getting at.
The only fees you should care about are selling fees if you decide to become a seller.
This is more common these days than it used to be as indies are promoting self-sales due to not having to lose the 30% cut that Steam takes.
Ars is a great website for sharing our love of duplicate games by giving away those keys too.
If I get a chance to put a lousy developer out of business by using G2A, I'm going to take it.
We also strongly recommend purchasing the Shield protection for your orders - this way we will be able to offer even more solutions with an even faster resolution of the issue.