how big is the effect of requesting aid on int'l?

@NixonDenier thank you for your informing answer,
I Have no problem with the airfare, essentials or other small expenses. But the tuition + room/board is far beyond the financial means of almost all Iranians.
So this is what I am asking: will my admission chances be lowered to below the rate of a need blind school?
Will having my stats help with answering that?