If it works, hell yes its worth it. Just so you understand the gamble. The chances really are low the the video card will be defective. Especially with Sapphire in my opinion. 6870s are only $160 here, that really sucks the 6870s are so expensive there.
I know International shipping is expensive, I shipped a carton of Camel cigarettes to an internet friend of mine in Krasnoyarsk, Russian Federation once, it was like $40 just for the shipping. It was worth it at the time I guess, I had a better paying job and he taught me to read and write English in Cyrillic, and quite a bit of Russian, sadly its been so long I've forgotten most of it.