Goulet, Edison, Gisi, Carolina Pen Company (Jonathon), F3/Fisher of Pens (me), Newton Pens, Opus (Dale), Mythic Pens (Brad), Jason Niel (Jason)
These are just a few that got started within a few years of each other, many of which cut their teeth on IAP and almost all of which don't frequent here anymore. There are lots more but this was just a quick list off the top of my head.
I went years without checking IAP but happen to be back with a change in philosophy about how I approach the artisan side of things and decided not to go the production pen company route.
Regarding this, you also have to consider that the number of people actively collecting top dollar custom fountain pens is also miniscule.