I've been to some rather large coin shows but not that one. I also go to about 2 to 4 coin shows a Month in my area. From what I've found over the many years of doing this is the larger the show, the more the prices of the coins. It really makes CENTS too. Since most of the dealers come from all over, they too have to pay for transportation, lodging, food, high table rentals, etc so they have to tack that on to the prices of their coins. Then too, even the customers usually end up paying more in parking, lodgings, food and in some areas entrance fees.
The standard coin shows in my area are free admission, free parking, most dealers come from the area so less costs for them, lower table rentals, etc. Therefore usually, not always, lower prices on coins.