The GPS requirement seems ridiculous. I understand why they are requiring it, but it really highlights how ridiculous tying services to geographic locations can be when the internet gets involved.
That being said, I'd buy one without hesitation if they were available in Houston.
That is what I was thinking. Publishing a hash along with the listing of the article would essentially be free as far as bandwidth costs are concerned which is what is supposed to be the reason for the fee.
I showed this to a lawyer friend of mine who also has a background in technology. While he thought it was a nice tool for preliminary or casual research, he said that ultimately he will still need to go and purchase the documents so that he is absolutely certain they are the originals since there doesn't seem to be a publicly available way to verify them.
A possible solution to this would be a published hash value from the original source.