A famous organ teacher is like a brand name you see on TV often enough. The fact that you know this teacher doesn't necessarily mean he is good for you (or you are good for him).
The best teachers I know let their students figure out the problems for themselves. They show them the way, lead them, inspire them but let them do the work.
Many superb organists are mediocre teachers. And the opposite is also true: many excellent teachers are mediocre organists.
If you feel discouraged that you can't afford a famous organ teacher, it's not clear to me that this isn't just one of the excuses your Resistance wants you to believe.
Remember, all help is self help (except maybe for surgery).