That's a very good question. And it seems that the answer, if the kindle file is destined to be uploaded for sale through Amazon, is no. Thanks for testing!
However, if one wants to distribute the kindle/mobipocket file oneself, perhaps by making it available for free on a web page, it might be useful.
On the third hand, I suppose the same could be done, apparently, by uploading the Amazon and downloading the test that Amazon creates for you, without ever actually making it available for sale.