The problem with pvp cave is that a lot of noobs gang you just because they can. When i go there with my lvl 14 ranger the low lvls gang me, then when i switch to druid and kill them, they ask why i killed them ...
Even if we have more players in the cave, if there's a gang of disturbers, and many people who continue to kill them, it doesn't slove the problem. Its just a war inside the cave.
Devs can't do anything about pvp cave, because its us people who created such an area in the first place. No matter where you go to have your pvps, there will always be gangers/jumpers/disturbers. We just need an option where people can request for a pvp like what others suggested in pervious discussions.