“Why has LV never had a team?”
Because of gambling and that not that many people live there.
I don't understand how the developers figure they'll consistently sell out an NFL-size stadium in a city with a population of about 600,000 ... which would make it the smallest city with an NFL team apart from Green Bay at 300,000. Then again, Green Bay is only 112 miles from Milwaukee (1.5 million) and is not in the middle of the friggin' desert!
Go figure!