There is no revenue, because I did not manage it for a long time. All banner links are without refs. But this extreme niche converts well, if you choose the right partnership program. It can be used, f.e. as affiliate site, or to start a CJ/top site. The main point is old, extablished domains with SE traffic (and dmoz listing). It still have some trusted backlinks from well-know sites, like kevscave, etc.