Correct - I have a mate who's company have 4 seats on level 2. They get 4 tickets to every game of football at Etihad. If he does not have any one to go those 4 seats will be empty - cannot be re-sold.
I think for all of the reserved seats there should be a system where the people who have these seats should have to call up the stadium lets say 1 day before the event to confirm they will be using them. Otherwise they are released for that night to the public.
Would mean a lot less empty seats and more people able to see it. I get sick of seeing empty seats on Level 1 and 2 especially.
And the same goes for the MCG