I think the diabolo is a labour of love, you have to transport it and they are tough to grasp at first especially some of the more difficult such genocides, I think half of it is intimidation, the only time you see a diabloist they tend to be phenomanal unless you go to workshops you don't see the average joe with a diabolo well not in London where I live, the other is space you need lots of space especially when learning and that's something all European cities seriously lack and the weather keeps us out of parks most of the year, ball juggling, yoyo, poi can all be done safely indoors, that's my take on it