I see what you mean, and I agree somewhat, but if you've read the reviews so far and are seriously interested in them, then I think you should buy them. It's not like you're just trying them out on a whim. I assume you want to keep them if you like them, and there's a good chance you will given how they're faring among others here who might have similar HP tastes as you. Even if you don't keep them, returning them's no loss for the merchant in the end. It's part of doing business, and it's not like you're trying to take advantage of the system, like some people do. Or you could sell them on Head-Fi. As regards getting drunk and buying the AKG's, NOOOOOooo!!!! How would you feel about yourself the next day?
EDIT: Also, isn't the Z1000 a domestic model there, and isn't it very close to the 7520 in some regards (at the least, physically, and sonically to some degree)? Couldn't you try that one as a "ballpark" test?