The fun factor is the joy of the hobby, I enjoy planes of all types and sizes myself. I had one club member I have never seen fly a plane but he owns planes from micro to 40%, seeing this mans hanger brings a tear to my eyes!! He has the money to just have his planes built for him then go out to his hanger and look at them. He must have over 50 planes out there. It seems to bring a lot of joy to his life.
As I mentioned, I fly my smaller planes a lot but enjoy my big planes too, that's one of the reasons I like IMAA so much. No contests at all, just showing off your giant scale planes to other people and flying them as often as you like. Then in the evening you can fly anything you like from electric to the big guys.
I find my giants fly smoother but I can do things with my small ones I can't even think about doing with the big ones. Well, maybe I can but it scares the heck out of me when I think about the wings folding. Just love flying my HOTS!!!