I agree: if you only consider extra revenue, it's not worth the extra effort. And yet, GNU/Linux is supported by many commercial games: Amnesia, SOMA, SpaceChe

I agree: if you only consider extra revenue, it's not worth the extra effort. And yet, GNU/Linux is supported by many commercial games: Amnesia, SOMA, SpaceChems, Towerfall, Braid, HyperLight Drifter, Shovel Knight, Undertale, VVVVVV, Hollow Knight, Overload, WarGame Red Dragon ... So there must be something else there than extra revenue.