Yeah you are right, it's worth a try (who know may be Microsoft is generous...?). And my guess is that that the people might lose their respect for IE 7 if Firefox 2.0 is really better. But you are right... what if they still give out the USB (even to Canadian residents)...
By the way I was wondering why the questions were there in order to get the USB drive? After deep thought I came up with something like this... If you answer all the questions right, then you don't need the USB, because you know most of the stuff already... if you don't answer the questions right then the USB drive might be for you, since you don't know anything.
I hope the questions weren't there to separate the people who want the USB from people who need the USB (because I have a feeling I answered all the questions correctly