I'm sorry but that does not make any damn sense to me. As long as they have the same quality of sound, I don't see how it makes a big difference. Unless you mean that the mp3s aren't synced together to make the whole album flow as one (like a lot of albums should), then I can see why this would be important.
But as far as eco friendly goes, wouldn't digital releases be the most eco friendly? I mean, no physical material to crap out or anything. I'm not saying that's where we should take it to, though. I mean, you can't really DJ if you got no hard material to use, etc. But I wouldn't care if people release music digitally or not, as long as it's good music.