Pen Collectors of America has a membership of 2000. When you're talkin' grass-roots, this is it.
This reminds me of SF fandom when I was much younger and still in high school. It still had the small community feel back then. The people I first met in fandom had been fans for ten or twenty years (or more), and these people had a friendly and encouraging feel to them. You couldn't find much SF related material around, so shopping at the dealer's room was wonderful, filled with things that were unusual or hard to find.
How times have changed.