At the end of the day, people play where they want to play. Forceing people to play somewhere they don't want to isen't going to help. All it'll do is leave you with less people logging and more angry people complaining about it.
People play in Liberty because its easier to find other people. If they'd wanted to play on thier own they'd play singleplayer. People also want to play with thier friends. If most people are already in Liberty, chances are that thier friends are too, thus they don't venture too far out.
Also, previous experience suggests if you start shouting at people to do something they don't want to do, they tell you to shut up and go away.