Interesting study… http://pubs.sciepub.com/education/6/9/3/
One conclusion from the data:
Taiwanese students go to Buxibans for actual study rather than killing time. On the contrary, half of Hong Kong students went to Buxibans for a greater amount of resources about learning English…they have a clear goal and long for learning more. The phenomenon also deserves English teachers’ attention. It could be stated that students feel they do not get enough English ability training from formal classrooms. This also explains why Buxibans have the opportunity to remain strong both in Taiwan and Hong Kong.