Fun has also been defined as "learning in a safe environment".
Fun is the emotional stimulation your brain receives when it is learning something new and exciting, or feeling something it has previously forgotten. Like the sensation of a roller coaster. You know how a roller coaster feels, but you don't ride one every day so you forget the sensation. Then you ride one suddenly, and its great fun. If you ride it 50 more times, its still kind of fun because its not normal, but its not as fun as it was the first time.
Fun is "subjective" because not every brain is interested in the same kind of experiences, or is even capable of learning them. These brains, who have selected competition as a low priority to fun, have no business playing fighting games. They will achieve just as much fun watching TV or a movie and saving money. In short, they will be gone soon anyway, so why worry about chasing them off. They will do that on their own.
On the other hand, if you take your approach and apply it to the competitive mind, he will become bored as well because he is no longer learning, and thus is no longer experiencing "fun".
So in other words, your approach doesn't really help anyone, Sam.
Then there may be hope for you yet.
http://www.sirlin.net/articles/playing-to-win-part-1.html