Disc golf is free to play and the discs are relatively cheap ($8-$15/disc). Also, the game is easy to catch on to, and it's addicting. Believe it or not, a pro league exists. The Pro Disc Golfers Association, or PDGA, is taken very seriously by many. www.pdga.com has a directory of courses all over the map. Check and see how many courses are in your area (its more popular than you think).
Disc golf, like regular golf, is a relaxing sport. For me, its a way to get out in the woods and away from society's noise-filled, fast-paced reality for a while. While perusing the internet, I discovered DeLavega, a course in Santa Cruz, CA. It is the #1 rated course in the world as it sits right on the ocean in beautiful southern California.
So, if you know someone who plays the sport, you should ask to join sometime, you won't be let down. As far as sports marketing goes, there is a long road ahead for Disc Golf. There is potential star power, however, the sport is often neglected when compared to regular golf.