Adding a second bot spawn to caverns would speed up the traffic through there a bit, but not require another zone. Sure, people will still complain, but they probably would if there were two caverns and two ubers too.
Disregard that, I saw the obvious flaw. Too many high RL's just afk in there from level 1 anyways.
The super gods are rewarded. They are given the power to say who does or does not get to get exp in the zones. They do this merely by afking in them in such ways that others are unable to use them and in such cases as uber unable to use them effectively. That is the negative bonus they have that actually hurts the server. They do have other bonuses and rewards though. They are the privilaged few who can use dz and centuria effectively. The fact that you rarely see them there is a testament that most of them would rather use the priviladges that are negative rather then positive.
They would much rather use th zones in ways they were not intended such as afk leveling and keeping lowbies out. Why not force them to use thier powers in a more positive way so that others can effectively play the game.
Take the example of the "new zone" with a permanent quest set up in it, we all clamor for quests, why not let a privilage of being a high rl be the ability to play one any time they want? or to play in a zone that actually gives them a challenge and has stuff in their packs that make a high rl prefer to farm there then in the low rl zones?
Sure, if it's more worthwhile for a supergod to go there, and it's inaccessible to the lower players, it could work. But if they go there and it's already occupied by two gods, they might just go afk in ubers anyways, and players will still unsavory woman. You'd need some way to make it good for multiple gods. Maybe a few rooms each with a super spike, an uber spawn, and a merchant so they can mine, cast, and sell gems constantly
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In all seriousness though, it's been this way for a long time, and it used to be worse. It's really not that bad. If you need proof, you're still leveling up aren't you? Sure, the gods get most of the xp because they're stronger. You want to punish the RL400's for dealing with all the same stuff you did, and possibly worse? Trust me, the gods would love to have a god only zone as good as uber or caverns, and we don't like having to share xp with the lower level players. But we've learned to cope. Sometimes, we even have to babysit the lower RL's by sacrificing exp efficiency and staying out of the mino pit or trying to protect them from ubers.