I think you're stretching it a bit with that. The only real way that prices can be deemed "unfair" is through provable collusion, i.e., if Sony, Nintendo and Microsoft got together and said that they wouldn't charge anything less than $70 for a new game. Since those three companies more or less run the console and handheld industry, it would be Unfair Business Practices and Unjust Enrichment, since there's no alternative.
As for the C&D, well, I've never been a big fan of companies using police-tactics against their fans who create derivative works, but they were within their legal rights.
Here is some info from the EFF:
"Courts have previously found that a use was fair where the use of the copyrighted work was socially beneficial. In particular, U.S. courts have recognized the following fair uses: criticism, comment, news reporting, teaching, scholarship, research and parodies."
So, the only real ROM hacks that would be considered legal are the spoof hacks that we all know and love. There was a link here earlier that led to someone hacking the rom to criticize Square-Enix's crackdown on Crimson Echoes, which was pretty funny and technically legal under this definition.
But enough about that; the point is whether or not Square used Unfair Business Practices in this case.
My understanding is that they used a loophole in the FFXI subscription service to overcharge their customers, which might be deemed illegal unless Square can prove that the wording of the "contract" was not misleading.