There was a Caesars 24/7 show taped at Caesars Palace for a very short time.
And while it isn't Vegas who can forget "Viva Laughlin"?
Good memory, it was only on for like 2 episodes.
Man vs Vegas, which was about a young guy who had lost a bunch of money in Vegas and was trying to win it back. He would place big bets for other folks at the tables to share the wealth.
Las Vegas (2003)
Should probably add Showtime's Gigolos to the list. Its a reality series that follows five male escorts in Las Vegas, both on the job and in their down-time. The part that amazes me is all the women who agree to be filmed having sex with these guys and then be interviewed afterwards. Not sure if its been renewed for a seventh season.