Vegas is a fun game. But it can also be very expensive. It's a points-based game where each point is given a money amount. We usually play quarters.
Four players, two teams. Both players on Team A make a pair of pars on the opening par4, for 44 points total. One player on Team B makes par, and his partner records a double bogey, giving them 46 points. So two points was all that exchanged on that hole, a whopping 50 cents. (the lowest score of the team is the first number used for the total)
Here's where the "risk" value comes into play, however, with this format. Any birdies made on a hole reverses the other team's highest score on the hole to be the first number used in their team total, not the lowest per usual.
Example: Ned and Ted are playing Ralph and Ron. On the par3 2nd, Ned makes birdie, Ted makes par, for a total of 23 points. Ralph Makes double bogey 5, Ron makes par. Ordinarily with no birdies - they would have 35 points total on that hole, but there was a birdie. So suddenly that is switched from 35 to 53. So Ned and Ted won the difference on that hole of 30 quarters. On this hole alone - $7.50 exchanged hands.
So you can see how it could and sometimes does get out of hand really quick if one guy isn't on his game for one hole, but another guy from the other team is. With birdies reversing the low-high to high-low number totals, there's a lot of stuff that can go on and it can get expensive over the course of 18 holes.
I lost 63 dollars last fall playing this with a couple other guys from our club. Of course - I've won more than my fair share playing it too. It just comes down to how comfortable you are with wagering and how serious you take it. If it's going to create issues between friends - this is not the game for them, for sure.