For me its seeing the improvement both in my gameplan and in my gameplay, afterwards its just the joy of being able to beat opponents whom I weren't previously or being able to beat strong opponents more consistently. Obviously if I didn't become any better at the game I practice and play then it's back to the lab whilst playing more and more to see what are my weaknesses that I need to improve upon.
The idea of seeing my friends again at small events or majors otherwise. It also gives me the greatest thrill when I actually can see my improvement overall when I play overtime. I also theory fight a lot when at work or away from home. Figuring out things on the training mode gives me great excitement. Just the whole idea of discovering new things. And, the rest is left up to aesthetic value.