I very rarely bet any money on my round, nor do the people I play with. True, there are people betting on their rounds, but I'd estimate it's 1 out of every 10 groups that goes out for a round that does that.
The article blows it out of proportion a little bit, too. At the courses I play (in the bay area), there are usually maybe 20 people in the clubhouse, and a round of drinks would probably come to $100. The "insurance" crowd is a very small subset of the golfing population.
True - it is an expensive sport and maybe traditionally a game for the wealthy, but my weekly golf habit doesn't cost much more than a gym membership. People from all walks of life play and enjoy the game, and it definitely doesn't have to be expensive unless you want it to be.