I don't think it makes any sense to list albums from all genres - it gets too confusing and there are rap albums on that list that I wouldn't even listen to let alone buy or rate as top anything. However, that goes both ways. I can think of trance and techno albums that are better than entries on that list, but they won't rank highly when combined with lists made from the usual suspect genres! Of course, then, it opens up that big can of worms as to agreeing on a list of genres in the first place.
Also, should the voting include "Best Of" albums? Some bands used to put out an entire record on the strength of one popular song. After about eight albums of this, they can then put together one killer Best Of album! Hehe...