A very famous game mode comes from Counter-Strike Nexon: Zombies... Zombie Hero! Zombie Hero is a Human vs Zombie PvP (Player vs. Player) mini-game which humans need to survive the attacks from zombies and one of the humans is going to become a "Hero" and another human will be "Side-Kick", those players will help you defeat the plague.
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This is the End. Thank you for playing Zombie Hero.
Every time I update the map, a bug appears. and when I fix that bug, a bug appears. It's nonstop. Now that I added abilities and evolution, the map received at least 60 new bugs. Keep in mind that 34 guns were planned to be added, that will cause mayhem to the map and add even more bugs. I need time to cool off to think weather I should remove this map or update it....in a long time. Keep in mind this is my favourite map out of all that I made, because not only it has one of the most complex systems of command blocks, it's the gameplay, it's original...it's unique. For now, I can say goodbye Zombie Hero.
Compared to the alternative, which is to take advantage of the ad-related revenue already attached to most types of content you might want to offer, and not have to worry nearly so much about driving your audience away with ad walls. That's how you GROW an audience, and when your audience grows, so does your revenue.
So you can take the short-term money from an ad wall, which is not going to be worth a whole lot, or you can develop an audience with respect for their time an their experience navigating to your content.
It's not much of a choice, really. :P