I watched the ESPN video.
Apparently, the lawyer is suing on behalf of all the affected spectators.
Sounds like he is suing for the difference in price between a 'premium seating game' option and a normal one.
So if 20,000 people were affected, and the difference in prices was $10, you're looking at $200,000.
You can see why the lawyer is doing it. If he takes $2 out of every $10, then he could stand to make $40,000.
IMO, it is damn stupid. Some people expect everything, and when things don't go their way, its straight to litigation *sigh*