why can i access the complete iTunes store from india?

"Can" or "Can not" (=can't)?

I think it's for copyright reasons. Not all things are available in all countries. I'm in France and am restricted to iTunes France, even though I would rather get some things from the UK iTunes store.

I think it is in Apple's interest to be in as many countries as possible. The fact that India continues to be ignored is more likely down to the studios, than any decisions taken at Cupertino. It is possible that major studios and music labels, who are already present in India in various capacities, prefer an alternative approach for the Indian market.