Information Valuation - The Most Buck for the Bits?

Rational asks: "I've heard of Everquest accounts sold for upwards of a thousand dollars... Considering that what is actually for sale is just an username and password, which generally comes up to less than 20 bytes in total, this amounts to over $50 per byte. What are the most expensive pieces of information that you have heard of, in dollars per byte? Perhaps satellite pictures? The Human genome?"