The best albums represent a complete journey of some kind. Listen to "Dark Side of the Moon", and see how many different styles, sounds and vibes it takes in from start to finish.

In short, it's hard to make a good, cohesive album without breaking a few rules and taking a few risks - and I can understand not many record labels wanting to do that, given sales are down anyway.

Anyway, aren't Live PAs and mixsets more like the "albums" of dance music?

Side note: I thought Loudboxer was pretty good...