morningbus
Serious Sam is a wicked gahbidge series for chowdaheads.
Steam doesn't get a cut from keys AFAIK, if a game uses steamworks, the publisher can generate as many steam keys as he wants for no fee from steam (I read that somewhere, someone correct me if i am wrong). I thought it was one of the upsides of using steamworks.
It isn't necessarily a function of Steamworks. If a game is sold on Steam, the publisher/developer can request unlimited free keys from Valve.