It's branded games by quickfire and netent (branded = provided with some license, game of thrones for example). Live games also usually cost good amount of money...I'm pretty sure this is sensitive information but here goes: which provider is the most expensive to have on your casino? Which one asks for the most % per played spin?
And it's never by % per player spin. It's always % on GGR (gross gaming revenue).
Br,
V.