Why opt for an international education school boards over Indian central or state board of school education?

These days schools are opting for IB or IGSCE boards which are international boards. The schools pay heavy franchisee fee and charge inexorbitant high fee. the gullible and rich parents are made scapegoat as they have the maens and it is presented to them that these boards are better than the Indian boards. while it has been proved that the indian system of education is one of the best in the world as far as curricullum planning is concerned. methodologies of teaching are a schools' prerogative, and these days there are many schools who are using latest well proven international teaching techniques. So where lies the difference? Or is it the indian mind set which accepts anything "foren" as better than Indian?Please list the advantages over Indian boards in genral.