Also, NFL is a heavy travel fanbase. Vegas seems perfect for that weekend bender these fans do. Of major sports teams, NFL is probably the easiest for fans since home games is only 8 games a season on the weekend. So I think it's easy for Vegas to support it.
And if the Raiders move to Vegas. And by move, being soon. The NHL will be the fat bridesmaid hoping to catch the bouquet, flailing and missing.