Quoted from Bryan_Kelly:It's pretty simple. The banquet makes the hotel a lot of money that goes towards the amount Expo has promised the hotel. That's why Mike insisted on having it.
I'm late to this, but... I had always been under a similar impression, but it's actually wrong.
I don't feel like I'm in a fair position to explain all that I know, but the banquet is a more complex thing. One thing I will say in it's defense, it did make Expo stand out.