Recycling issues

What prevents livejournal usernames from recycling?

Currently, deleted journals claim that they will recycle . . .
http://livejournal.com/~furry
http://livejournal.com/~raincat
for example


a lot of threads claim recycling works . . . this one on renaming
http://www.livejournal.com/talkread.bml?journal=lj_dev&itemid=342290
for example

yet I know of no journals that actually recycled. Ever.

Any observations to add? Questions/comments/statements/manifetos to hopefully clear up this inconsistency?

http://www.callete.com/~highway/supporthistory.bml?user=stars_pyre