Utility. It is the safest, simplest way to buy anything from anyone in the world.
I think this is a bit optimistic. Exchanging and managing bitcoins still requires the use of a computer and an internet connection, which makes it vulnerable compared to physical money from a established currency. Since it is still a very new currency there are also risks of the whole system crashing down due to unforeseen reasons.
However it's probably the easiest way to make anonymous payments.
I hear what your saying and you may be right. But if one factors in the complexity of setting up an bank account and getting it linked to a credit card, then bitcoin may compare more favorably. Once your client is up and running, pulling he trigger on a purchase is easy.
When it comes to international sales I think bitcoin is even more powerful. I bought a food recipe from a student in China once. Can you imagine how difficult that would have been without bitcoin?