I agree that the benefits of "hi-res" stereo files over CD-quality can be elusive. Totally agree that most cannot hear it and it only matters for certain kinds of music (think classical with wide dynamic range).
What I want to see are files you can download that are in surround. If you've ever heard a good surround SACD or DVD-Audio, and compared the immersiveness of the mix to plain ole' stereo....it's is night and day. Just like stated in this article, there are good and bad (e.g., gimmicky) surround mixes, but the good ones will drop your jaw.
Case in point, I have a hard time listening at home to Dark Side of the Moon in stereo, even though it is easily streamed from my Apple TV to my nice speaker system. Even putting Dolby Pro Logic II or DTS Neo:X on to turn into into pseudo-surround doesn't cut it. Nothing beats the carefully-crafted surround mix of the 2003 SACD release...it's worth paying a premium for is the bottom line.
This is what "hi-res" outlets should focus on, although I realize the additional effort that goes into converting the original tracks into a surround mix...far more effort than just "remastering" the same mix into a higher-res file (if even they do that).