The site really is quality, and I definitely understand why they want to keep hold of it. But if that means the music being ridiculously quiet, then you have to wonder if it would be better to use a different, lower quality site, but with fewer volume restrictions.
I was even wondering if they could run until 2am instead of 4am, and thus have it louder, but as people have pointed out - the music went reeeeaaallly quiet at midnight. So, the only solution seems to be either move sites, or stop the music at midnight, which would never happen.
So yeah, as far as I can see Glade will stay there, and will hence always be really quiet.
It's gutting, cos the festival has an incredible amount of potential, and as Jay said there has been more and more techno each year recently, but I don't think I'll be going back. The pitifully low volume just killed everything off...