Over half the names in the data base never made a post and just were on for an hour or two. There are a fair amount of names that were claimed by Spammers. Spammers will often create several names, use one to spam the site then get banned blocking the usefulness of the rest. A spam ban is long enough that they lose interest in retaining a list of the previous names they have created. Believe it or not, the spammers have claimed some pretty good names taking them out of circulation. I suspect of the 25,000 names that have been claimed, we will lose over half and nobody will miss them.