I play a single game file for 500+ hours and then can't reset it. Even if I transfer all of the good pokemon to another game, I can't erase a file with that much time on it. Especially if the journey stared date was the date of release.
I have to buy both versions of the game (at different times) just to start a new adventure once in a while.
My White has 300+ hours, and I have finished 3 different games in Black.