We're all only guessing, but the 100,000 presumably comes from John, but I have also heard he has 39,000+ customers on his database alone. But that will include people no longer active I would have thought, and of course the many casuals. There are plenty also suffering from with retinovinyl disease (the types who slowly paw through every record box, looking intensively at each record but rarely if ever buying anything). Hard core collectors that buy regularly / semi regularly well under 10,000 WW is my guess. But it is just that a guess.