whfarro - it's not necessarily important. I could grow trees all day long and not really give a hoot who else does it. it's interesting, and that's why i am asking the question. just curious how many of us there are, because in my experience it seems like a very small club. by the numbers thrown around here an incredibly small club. you'd be hard pressed to find a more marginal activity it seems! Perhaps I may inquire why ask why? Does everything asked need to be important? Who determines what is important? This is supposed to be fun right? So let's have fun, and find interest where we may.
It's not important. It's just kind of interesting that someone wants to put a number on such a diffuse set of people.
Given the mostly solitary nature of bonsai, "bonsai hermits" are not uncommon (I think they may be the most common). More than a few of my bonsai friends consciously avoid the 'net and clubs. They're in it for the trees only and when they want to talk bonsai, they do it IRL with other hermits.
They are the "mountain men" of bonsai, coming in from the cold only when they need supplies or when a good show is around. Other than that they don't say much. Most of them have decent to spectacular trees.
Another group of bonsai enthusiasts comes and goes at will, delving into other projects and interests, only to return years, or even decades later.
Another group is doing something they don't know of as bonsai. Model railroad hobbyists, for instance, use real miniature trees in garden railroads. Those trees are pruned and kept tiny but not for "bonsai," but because they would look weird next to small model trains if left untended. If you ask their owners about bonsai, they will say they are train enthusiasts, not bonsai hobbyists...Trough and container gardeners are also doing bonsai in one form or another, too.