The Gomorrah floor manager was hired by the Omertas' to make their casino more approachable and guest friendly. The casino does this by having their floor manager give out special prizes like food and drink, which entices Strip visitors to make use of the establishment (which, in reality, brings in more caps for the Omertas).
The floor manager will give the Courier food and drinks to encourage the player to gamble. The food and drinks will be given if the player wins some money. If you win too much and break the bank, the floor manager will ask the player to leave the casino and stop gambling at that establishment.
Big Winner, The Gomorrah: After winning 2,250, 4,500, and 6,750 chips from gambling, the floor manager will reward you with special prizes. However after winning 9,000 chips, he bans you from playing at Gomorrah.