Another thing to keep in mind, if a copyright orphan bill ever gets passed, is that changing identities will make it more difficult to find the copyright owner of a work and will effectively orphan the works under the old identity. It's not a permanent loss because copyright ownership can be established again. 

A prolific artist, signing works with various user names and IDs, is creating a situation where it will be difficult or impossible to trace those works back to the original artist as the artist switches to new IDs and email addresses.

Minimizing changes to identities will make it easier to retain copyright control over one's works.

I wonder if the feature change, charging for name changes, explains why there were a rash of them all at one time.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon