Good point. I routinely pay $2.49 per track over at Beatport for DRM free 320 kbps quality. Can I find the same music on iTunes or Amazon? Sometimes, but there's a premium that Beatport can demand through having exclusive / niche content, which seems lost in the context of this discusstion (more or less).
Is that really the case? Most vendors selling MP3 format music are DRM-free.