I am now a member of the Video Arcade Preservation Society.  I registered my Ms. Pac-Man and Tron Arcade machines.  VAPS is managed by KLOV.com and has been around since 1990 (before the internets was big!) There is an extensive listing of members and games.  You may list your arcade collections, whether of not your machines as “for sale” or “not for sale” and invite visitors to your collection.  You can browse member lists, check out their collection sizes and if you feel like it (and where allowed)–you can go visit their collections.

Direct Link to my VAPS entry.