Heck, I think a lot of folks would like it if iTunes sold AAC songs with higher bit rates. I have no use spending a buck for a song that will sound terrible in whatever you play it with. If iTunes offerings were 320 AAC, then I might would buy some random items.
I don't see them ever selling the lossless songs with out some sort of DRM. Even if they used ALAC (it has DRM I assume), the bandwidth out of the iTunes server would go up 10 fold right off the start. Slowness, or they have to pay a lot more to pump out that kind of bandwith with tolerable speeds.
Another question: would you pay full CD price for a CD song list, in DRM lossless format? Assume that you could sample hear the music, and there would be very limited burning of the tracks to a CD. I think I would. But I won't pay for less than lossless at this point in my HeadFi career, so I still buy the CDs that I am interested in.