I did a bit of research before and after posting this thread and I found this
It's a bug that is fixed upstream since 2005, I don't know why it pops up now.
Anyway I see no reason to leave it running, it's not a mayor issue since this remote desktop is used by a couple of users (so 6 processes running) but like stated on the bug:
Not sure if gnome-session is the right component, but gnome leaves
atleast gnome-keyring-daemon and bonobo-activation-server running
after a logout.
Seems unnessesary. (Think schools, public libraries etc. filled with
those for every usre logged in.)
it looks like a dbus bug.