[Barrin92]

>What % should they charge then?

How about we go by European credit and debit card interchange fees capped at 0.2%. Credit Card CEOs seem reasonably happy, healthy and well fed. Maybe we'll get some cultural surplus value out of it if Valve is actually forced to make a video game again, Half Life 3 might actually happen, or maybe we'll get a new Portal or Team Fortress out of it.

[TillE]

All of these platforms do far, far more than just basic payment processing.

[noiseinvacuum]

I think that is why payment processing fees and platform fees need to be separated out.