I suspect that this may be the case in Bangladesh, Nepal while India and Sri Lanka have a surplus of qualified teachers and I stand to be corrected if this is not true.
Even if there is no overall excess supply of qualified teachers, why can’t a body such as SAFA pool their teaching resources,  2  BIS Review 32/2005  develop a common curriculum and testing and evaluation procedures, make increased use of videoconferencing, broad band connectivity, electronic discussion groups, virtual teaching and economize on physical presence of the teachers.