[gopi]

Instead of creating a c-corp in US and debating how much profit to leave in US just create a US LLC owned by your home country corp. Thus the profit just passes to your home country corp and you will pay tax on it in your home country.

Also with this setup you can pay all your US expenses (hosting, advertisement etc) out of your US LLC. I am not a lawyer or CPA so discuss this suggestion with a experienced professional

[jibjab]

I think you're referring to the same setup as rprasad was talking about in his comment (http://news.ycombinator.com/item?id=3055493).

(If I'm correct) When a US company pays dividend to it's non US parent company, the US charges a withholding tax of 30%. This can be less if there's a tax treaty between the two countries.