All I did was copied and paste. I wasn't in attendance @ Grace, but I was watching it on the You Tube feed.
From the one camera shot, you could see the chairback seating (the "richie-rich" seating) and the lack of people being seen was evident. My guess is, that the powers that be, use the season ticket holders and single ticket holders to "call the official attenedance" whether they're present or not.
Not the first time, or the last, that this may happen.
If it makes you, happy, I'll make sure to not include that bit of information... feel better?
D3