Crowds? High Fidelity? Where? I've tried it, and it's mostly empty.

High Fidelity may have made the mistake of bringing up their world empty. They should have used a terrain generator and SpeedTree to fill the world with virgin, natural terrain. Then let people buy real estate, clear it, and develop.

This would also impel people to do good graphical work. SpeedTree builds a good-looking nature. It would encourage people to try to do as well with what they build.

Only SL has some crowd. Highfidelity has some good architectural ideas, but development is moving so slowly. They deliberately chose empty regions, though i think they will eventually have to add extensive in-world building controls to make building more fun.