Perdue, my theory is that there just aren't that many who actually know how to build one. My dad built one with me when I was a kid, an Astro Hog. I could not believe how much time and perfection went into it. That kind of model building takes some dedication. They don't teach that in schools (stupid schools). Many probably are too afraid of messing up building it with that kind of money.
Then you have to fly the damn thing.
It's a challenging hobby, a great hobby, and one that should be passed down. I believe that's ARFs, and even RFs are great for the hobbies because it allows people to dabble in the hobby and learn more about it. Then they can get into actually building one. I hope that these hobbies grow, but they are very expensive for young adults, many who don't have a clue what they are doing.