The word that someone was looking for those who are there just to be noticed or to be the center of attention would be a egocentric or narcistic personality or personality disorder but that is pushing it. I would assume ---assume that anyone who involves themselves in Bonsai by putting in many hours is definitely concerned with detail and yes, this could be OCD. Teachers scientists, accountants, chefs, anyone who likes the detail. Without giving away too much of myself, I researched for years illegal drugs as in the intrasynaptic processes. I also cook with attention to detail and play pool with attention to detail.
You bring up a good question which has many answers which you could ask: how did this all begin. What were the motivating factors that led us to do Bonsai. Just a tad bit deeper question.