I really think this is a highly under used convenience not only by tourists but locals.
If you are like me and take a stay cations how convenient is it to stay at your favorite spot and take a quick ride to your favorite restaurant on the other side of the strip! It is fast and cheap for locals. For tourists it is still cheaper to buy a three day pass then pay for cabs the whole stay or you can go the metro bus route and add an extra 2 to 3 hours to your travel time!
I love this option and wish it would run out to my house so I could come down and have some fun and not need a DD!