Dave de Vos
I'm not sure I understand your question.
I used to be committed to improve the quality of my play in go by sticking to fundamentals, making sound choices on each and every move to avoid getting myself in a "stuck" situation where I would have to revert to "ugly" moves.
I kind of got the feeling you lost interest because you did not make any progress anymore. This suggests your focus is not on the game itself, but on winning, progress, achieve the next rank.
In other words, when you think your progress comes to a halt, your commitment is what makes you continue, regardless.
I hope this makes sense.