Well... maybe in some sections of the stadium but that is not the deal with sparsely empty seats. When show is really sold out it is sold out and you cannot see a single empty seat. I've been in many sold out stadium shows and there haven't been seats emty. Maybe some sections near the stage or ground might be unavailable but that is the case. If you wanna know what really means sold out you can watch some pictures of them for example Munchen 06 and Giants 06... and well the situation is the same with every really SOLD OUT show.