This is one of those things that can never be mastered. There are an infinite number of skill plateaus to achieve. That is true for the flying and the building. Even if you are the best at your club, you are still competing with yourself.
The hobby is constantly evolving and there seems to be a constant influx of technology. From Park Flyers to turbines to choppers to twins to scratch building, there are more disciplines than anyone can master all at once. Been there? Done that? There is plenty more to try! Pylon racing, scale, TOC, IMAC, mini MAC , float planes, pattern, warbirds, combat, formation, and believe it or not . slow flight is a ball.
And the people ! The BEST friends I have ever had have come from this hobby. One of the greatest things about this hobby is the people and the "mix" of people. Lawyers and pipe fitters hanging out together! All walks of life, all incomes, all sociological stratums mixed up and nobody cares who makes what or who does what! Its like we are all kids. That alone tells you there is something special going on in this hobby.