I don't really think this would ever get made and I don't really care if it does. I just had a little idea and I wanted to share it.
Here is my vision: A huge forest with very very tall trees. A large meadow in the center. There are no revives, tps, or service stations for miles. There also arn't any mobs for miles around, except for the boss mob in the center of the meadow. The boss mob is a giant mushroom like creature, kinda like the mushroom creatures we already have, but a little different. This mob wouldn't take anything to spawn and would just be there. The mob would be about twice the size of Emerald Lakes Mall. This mob wouldn't attack and it would initially have infinity health. In this way sweaters could come to the mob and just sweat it all day long (though keep in mind that the area would be extremely far away from any TP so the sweaters would have to drive, fly, or walk for a very long time to get to it and from it). This would be especially useful for sweaters who just want to grind SG and Concentration. Or, if a hunter happened to not care about loot and just wanted to churn peds into skill then he could come and continuously shoot the mob. Maybe the hunter wants to blow off some steam and just wants to shoot at a boss mob like a crazy man.
Now, this is where it gets interesting. The mob would have two health bars. The mob would initially have infinity health, but if enough damage was done to it over a specific amount of time (let's say one hour) then the infinity bar would break and the creature's real health bar would be shown. This creature would have tons of health and plenty of regen so that it would take an army to kill it. Also, when the infinity bar breaks a wave event begins where the boss mob sends out baby mushrooms of varying health to attack the attackers. The people attempting to kill the boss mob would have to defend against and kill the baby mushrooms so that they wouldn't die and would be able to kill the giant mushroom. (importance would be placed on staying alive because the nearest TP and Revive would be more than a few jumps away). This would take a huge community effort to take down the mob as well as a lot of strategizing. The loot distribution would be like it is for many large events like this (distributed to all the people who shot at it). And, of course, this mob would have a minimum 10kPED loot in order to really make it exciting.
After the Boss mob is killed it would have a respawn rate of, let's say 2-4 weeks before another would spawn. In this way MA
would loose only a constant of about 1kUSD from it every 2-4 weeks so that it could be easily tracked and monitored. Maybe more depending upon how lucky the people are, but most likely only about 1k. MA
would probably make way more than 1kUSD on each mob in decay and ammo anyways.
That's my idea