The last server I played on before Ground Zero had invulnerable LCBs (like we have now) and server-wide PvP.  It is now defunct but it was a fun server to play on.

The Ground Zero server is also tons of fun to play on and, arguably, I think they have a better system with the North/South divide.  People who want to PvP can simply build in the south while those that don't simply build in the North. 

The divide also lets non-PvP players cross the border and try their hand at PvP without having to commit to PvP all the time.  Some will make the switch.  Some won't. 

Having that option also attracts more players to the server and that's a good thing.

I'm not so sure it's a good argument to say that you don't want to come by because you might get shot, while at the same time arguing that you don't have enough people to shoot.  It's a two-edged sword.  Just ask Belinik - he pops a cap in our asses all the time around Bumbaloo castle, the town we're in, etc.  We shoot back if we can and sometimes we just stay in the castle while under siege and moon him instead, while eating meat stew and drinking beers.

I built Bumbaloo Castle in the south and in a town, specifically so it would stick up and be noticed and easy to find.  You're always welcome to come by and try your luck.  We've been so busy building stuff that we're not even properly geared up for PvP yet, so we're easy kills.  Really.  We are.  Try it.