They show other advertisers, but you must realize that King is paying a fortune to advertise CCS through just about every ad provider. Hell, I've seen TV ads for CCS. Crazy.
It's crazy that they can afford to pay $4+ for a free install. I guess they must account the organic downloads they get as a side effect but still..
I thought I had good conversion numbers so far but there's no way I can get an average $4 LTV out of every free download (minus the 30% Apple cut on top of it). The money bleeding out to pay these on a daily basis must be insane.