The Vegas deal is much different. It is a new hotel room tax, roughly $4-$6 per room per night. The major problem with this is if an economic downturn hits and the visitors stop coming to Las Vegas the county is now on the hook for this money. Then the taxpayers of the county would be required to take on that load.
Also, it has been proven through multiple studies that there is a peak to the amount of money spent on "entertainment" and in Las Vegas case that includes hotel pricing. So if you figure that the normal visitor spends an extra $20 (4 night stay) on their room, that's $20 less on gambling, dining, shows and tips per trip. That translates into less money actually hitting the Las Vegas economy. Take $4 per room x 62,000 rooms (on the strip alone) = $248,000 per day diverted from the Las Vegas economy. At 365 days a year this is $90,520,000 diverted from the local economy. Granted this is an overly simplistic view and the impact will most likely be lower than this number due to some people still spending that extra $4/day and hotel rooms not being at 100% occupancy.
Finally, the same logic as above if you have a limited amount of money to spend on entertainment add in the cost of a ticket to NFL game and now you are taking $75 per ticket x 60,000 fans x 8 games = $36,000,000 per year in lost gaming, dining and show money to be spent.