From what I understand there is 3 caps that gangs fight over for like 2-3 hours. When the it's over the top 3 gangs all get a certain amount of money. However, a lot of these other servers that have "conquest" or something like it are trying to baby their cartel players by not allowing bounty hunters to camp rebels or warzone and what not. The other thing, is that I don't know if we would have a second server for it which would inherently mean a lot of people wouldn't be able to get into the server when it happens. This would almost certainly result in a lot of backlash. From what I have seen from the montages, conquest looks like a zerg fest with 5 different gangs trying to kill each other at some random ass place. I could see how it would be fun initially but I also think it would get old really quick as I prefer to fight gangs/cartels the way people do now. The other pain in the ass that I personally see with it is that it would attract a metric shit load of closet cheaters to deal with. In addition to that, one might think it would help our population out but in reality most of the people who play in conquests from what I've been told only log on for conquest and rarely much of anything else.
Group cap is in any capacity is aids. Get the numbers to compete or suffer with less. It was removed from asylum for a good reason.