Have you considered doing a running purge? For example, purging accounts inactive since 1-02 to 1-15 in a month, 1-16 to 1-30 in 6 weeks, etc? It sounds like it'd be a really good source of revenue because I know that I'd personally spend at last $40 on rename tokens (plus a couple paid accounts) for journals created in January during the GJ exodus that've been abandoned.