I'm sure there'll be a lot of **** and moaning (isn't there always) but charging a fee to transfer Home Servers is a very good idea. Give people more of a stake in ensuring their World is competitive in WvWvW rather than having migratory flocks swapping between homes seeking an advantage and ensuring the balancing system can never hope to keep up.
And letting people hop on a different server as a Guest makes it easy for everyone to play with their friends in the regular content, even if their super serious WvW guild calls somewhere else home.
"Wasabi is a sometimes food." - Elmo