"Transferring from a Congested World to a Preferred World will earn you the bonuses described below.

These bonuses will remain in effect until the active player population of Congested and Preferred Worlds has stabilized, but please note that the population status of a World is subject to change.

World transfer bonuses
Transfer is free of charge"

Lamia is a Standard World. Infact, there are no congested worlds currently. (Until Balmung becomes one again within the week)